x+21=-x+87

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


Simplifying
x + 21 = -1x + 87

Reorder the terms:
21 + x = -1x + 87

Reorder the terms:
21 + x = 87 + -1x

Solving
21 + x = 87 + -1x

Solving for variable 'x'.

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

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

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

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

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

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

Combine like terms: 87 + -21 = 66
2x = 66

Divide each side by '2'.
x = 33

Simplifying
x = 33

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