3. Let the expressions $A$ and $B$ be given as:

$$
A=2 x+13+11 x-4-5 x+6 x+12 \text { and } \quad B=9+3 y+14 y-4-5 y+7-y+5
$$

If $x=6$, calculate $y$ so that the values of the expressions $A$ and $B$ are equal.
First method:

Simplify each expression:

| $A=2 x+13+11 x-4-5 x+6 x+12=14 x+21$ | 1 POINT |
| :--- | :--- |
| $B=9+3 y+14 y-4-5 y+7-y+5=11 y+17$ | 1 POINT |
| For $x=6, A=14 \cdot 6+21=84+21=105$. | 1 POINT |
| We are looking for $y$ for which the expressions $A$ and $B$ will be equal: |  |
| $11 y+17=105$ | 1 POINT |
| $11 y=105-17$ | 1 POINT |
| $11 y=88$ |  |
| $y=88: 11$ | 1 POINT |
| $y=8$ | mo............................................................................................ |