21-x=-87-2x

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


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

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

Solving for variable 'x'.

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

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

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

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

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

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

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

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

Simplifying
x = -108

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