-y+21=2y-87

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


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

Reorder the terms:
21 + -1y = 2y + -87

Reorder the terms:
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 = -3y
21 + -3y = -87 + 2y + -2y

Combine like terms: 2y + -2y = 0
21 + -3y = -87 + 0
21 + -3y = -87

Add '-21' to each side of the equation.
21 + -21 + -3y = -87 + -21

Combine like terms: 21 + -21 = 0
0 + -3y = -87 + -21
-3y = -87 + -21

Combine like terms: -87 + -21 = -108
-3y = -108

Divide each side by '-3'.
y = 36

Simplifying
y = 36

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