99-120=-8(-4y)-17(2y)+y

Solution for 99-120=-8(-4y)-17(2y)+y equation:

Simplifying
99 + -120 = -8(-4y) + -17(2y) + y

Combine like terms: 99 + -120 = -21
-21 = -8(-4y) + -17(2y) + y

Remove parenthesis around (-4y)
-21 = -8 * -4y + -17(2y) + y

Multiply -8 * -4
-21 = 32y + -17(2y) + y

Remove parenthesis around (2y)
-21 = 32y + -17 * 2y + y

Multiply -17 * 2
-21 = 32y + -34y + y

Combine like terms: 32y + -34y = -2y
-21 = -2y + y

Combine like terms: -2y + y = -1y
-21 = -1y

Solving
-21 = -1y

Solving for variable 'y'.

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

Add 'y' to each side of the equation.
-21 + y = -1y + y

Combine like terms: -1y + y = 0
-21 + y = 0

Add '21' to each side of the equation.
-21 + 21 + y = 0 + 21

Combine like terms: -21 + 21 = 0
0 + y = 0 + 21
y = 0 + 21

Combine like terms: 0 + 21 = 21
y = 21

Simplifying
y = 21