We are given a triangle $ABC$. Points $D$ and $E$ on the line $AB$ are such that $AD=AC$ and $BE=BC$, with the arrangment of points $D - A - B - E$. The circumscribed circles of the triangles $DBC$ and $EAC$ meet again at the point $X\neq C$, and the circumscribed circles of the triangles $DEC$ and $ABC$ meet again at the point $Y\neq C$. Find the measure of $\angle ACB$ given the condition $DY+EY=2XY$.
1. **Claim 1: \(X\) is the \(C\)-excenter of \(\triangle ABC\)**

   - Define \(X'\) as the \(C\)-excenter. From angle chasing, we have \(\angle DCX' + \angle CX'A = 90^\circ\), which implies \(X'A \perp CD\).
   - Since \(CA = AD\), \(X'A\) is the perpendicular bisector of \(CD\). Therefore,
     \[
     \angle X'DB = \angle X'DA = \angle X'CA = \angle X'CB
     \]
   - Thus, \(DCBX'\) is cyclic. Similarly, we can prove that \(ECAX'\) is cyclic. Therefore, \(X = X'\).

2. **Claim 2: \(X\) is the circumcenter of \(\triangle DCE\)**

   - Since \(X\) is the \(C\)-excenter, \(XA\) is the perpendicular bisector of \(CD\) and \(XB\) is the perpendicular bisector of \(CE\).

3. **Define \(O\) as the circumcenter of \(\triangle ABC\), \(T\) as the midpoint of arc \(\widehat{AB}\) not containing \(C\), and \(Z\) as the reflection of \(X\) with respect to line \(AB\)**

   - By Claim 2, we have \(XY = XC\), hence \(XO\) is the perpendicular bisector of \(CY\).

4. **Claim 3: \(T, Z, Y\) are collinear**

   - Define \(F = ZT \cap AB\) and \(G\) such that \(GT\) is tangent to \(\odot(ABC)\) and \(A, G\) lie on the same side of \(CX\).
   - To prove the claim, we need to show that \(\angle ZTG = \angle YTG\). Note that
     \[
     \angle ZTG = \angle ZFA = 90^\circ - \angle XZT
     \]
     and
     \[
     \angle YTG = \angle YCT = \angle YCX = 90^\circ - \angle OXC
     \]
   - We need to prove that \(\angle XZT = \angle OXC\). Using complex numbers, we assign \(a = p^2, b = q^2, c = r^2\) with \(|p| = |q| = |r| = 1\). It's easy to check that \(t = -pq\) and \(x = qr + pr - pq\). \(Z\) is the reflection of \(X\) with respect to line \(AB\), so
     \[
     z = a + b - ab \overline{x} = p^2 + q^2 - p^2q^2 \left(\frac{1}{qr} + \frac{1}{pr} - \frac{1}{pq}\right) = \frac{p^2r + q^2r - p^2q - pq^2 + pqr}{r}
     \]
   - It suffices to prove that \(\measuredangle CXO = \measuredangle XZT\), which is equivalent to \(\frac{o - x}{c - x} : \frac{t - z}{x - z} \in \mathbb{R}\). We have
     \[
     \frac{o - x}{c - x} : \frac{t - z}{x - z} = \frac{pq - pr - qr}{r^2 - pr - qr + pq} \times \frac{qr + pr - pq - \frac{p^2r + q^2r - p^2q - pq^2 + pqr}{r}}{-pq - \frac{p^2r + q^2r - p^2q - pq^2 + pqr}{r}} = \frac{pq - pr - qr}{(r - p)(r - q)} \times \frac{\frac{(p + q)(r - p)(r - q)}{r}}{\frac{(p + q)(pq - pr - qr)}{r}} = 1
     \]
   - Hence, the claim is true.

5. **Define \(F = \overline{TZY} \cap AB\)**

   - It's easy to see that \(Y, Z\) lie on the same side of \(AB\). Moreover, because \(T, Y \in \odot(ABC)\) and they are on different sides of \(AB\), \(F\) must lie on segment \(AB\).

6. **Claim 4: The condition \(DY + EY = 2XY\) implies \(Y = Z\)**

   - Notice that \(XY = XE = XD = ZE = ZD\). So, \(DY + EY = 2XY \implies DY + EY = DZ + EZ\).
   - Assume the contrary that \(Y \neq Z\). Then from \(F, Z, Y\) collinear, \(F\) lies on segment \(AB\), and \(Y, Z\) lie on the same side of \(AB\), we must have either \(Z\) lies strictly inside \(\triangle DYE\) or \(Y\) lies strictly inside \(\triangle DZE\).
   - If \(Z\) lies strictly inside \(\triangle DYE\), it's well known that \(DY + EY > DZ + EZ\). A contradiction.
   - Similarly, if \(Y\) lies strictly inside \(\triangle DZE\), we have \(DZ + EZ > DY + EY\). Again, another contradiction.
   - Therefore, we must have \(Y = Z\). Claim 4 is now proven.

7. **Final Calculation**

   - Notice that
     \[
     \angle DYE = \angle DCE = \angle DCA + \angle ACB + \angle BCE = \frac{\angle CAB}{2} + \angle ACB + \frac{\angle CBA}{2} = 90^\circ + \frac{\angle ACB}{2}
     \]
     and
     \[
     \angle DZE = \angle DXE = 2(180^\circ - \angle DCE) = 180^\circ - \angle ACB
     \]
   - Because \(Y = Z\), then
     \[
     90^\circ + \frac{\angle ACB}{2} = 180^\circ - \angle ACB \implies \angle ACB = 60^\circ
     \]

The final answer is \(\boxed{60^\circ}\).