3. In triangle $A B C$, a point $D$ is taken on side $B C$. It turns out that $A B>A C=4$, $A D=3$, and triangles $A B D$ and $A C D$ are isosceles. Find $B C$. If there are multiple answers, list them in any order separated by a semicolon.
Answer: $7 ; 8 \| 8 ; 7$

Allowed for input: digits, a dot or comma as a decimal separator, division sign, semicolon

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