Question 104822
Distribute the 5, then collect your y-terms and solve for y.

5y+15-2y = 6 => 5y-2y + 15 = 6 => 3y +15 = 6
subtract 15 from both sides

3y +15 - 15 = 6 - 15
3y = -9 (divide both sides by 3)
y = -3