21=x-87+2x

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


Simplifying
21 = x + -87 + 2x

Reorder the terms:
21 = -87 + x + 2x

Combine like terms: x + 2x = 3x
21 = -87 + 3x

Solving
21 = -87 + 3x

Solving for variable 'x'.

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

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

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

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

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

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

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

Simplifying
x = 36

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