Question

5y+17= 2y-25 what is the value of y?

Answer 1

$5y+17= 2y-25\\\\5y-2y=-25-17\\\\3y=-42\\\\\boxed{y=-14}$

Answer 2

 15y + 17 = 2y - 25

Subtract 2y from both sides

5y + 17 = 2y - 25
-2y            -2y
-------------------------------
3y  + 17 = - 25

Subtract 17 from both sides

3y + 17 = -25
     -17      -17
---------------------------
3y = - 42

Divde by 3

3y = -42
 /3      /3

y = -14