x+21=21-x

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Solution for x+21=21-x equation:


Simplifying
x + 21 = 21 + -1x

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

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

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

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

Solving
x = -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.
x + x = -1x + x

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

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

Divide each side by '2'.
x = 0

Simplifying
x = 0

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