21-1y=-87-2y

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Solution for 21-1y=-87-2y equation: 


Simplifying
21 + -1y = -87 + -2y

Solving
21 + -1y = -87 + -2y

Solving for variable 'y'.

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

Add '2y' to each side of the equation.
21 + -1y + 2y = -87 + -2y + 2y

Combine like terms: -1y + 2y = 1y
21 + 1y = -87 + -2y + 2y

Combine like terms: -2y + 2y = 0
21 + 1y = -87 + 0
21 + 1y = -87

Add '-21' to each side of the equation.
21 + -21 + 1y = -87 + -21

Combine like terms: 21 + -21 = 0
0 + 1y = -87 + -21
1y = -87 + -21

Combine like terms: -87 + -21 = -108
1y = -108

Divide each side by '1'.
y = -108

Simplifying
y = -108

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