-(y+15)+2y-12=-42

Solution for -(y+15)+2y-12=-42 equation:

Simplifying
-1(y + 15) + 2y + -12 = -42

Reorder the terms:
-1(15 + y) + 2y + -12 = -42
(15 * -1 + y * -1) + 2y + -12 = -42
(-15 + -1y) + 2y + -12 = -42

Reorder the terms:
-15 + -12 + -1y + 2y = -42

Combine like terms: -15 + -12 = -27
-27 + -1y + 2y = -42

Combine like terms: -1y + 2y = 1y
-27 + 1y = -42

Solving
-27 + 1y = -42

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '27' to each side of the equation.
-27 + 27 + 1y = -42 + 27

Combine like terms: -27 + 27 = 0
0 + 1y = -42 + 27
1y = -42 + 27

Combine like terms: -42 + 27 = -15
1y = -15

Divide each side by '1'.
y = -15

Simplifying
y = -15