-21+x=x-21

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


Simplifying
-21 + x = x + -21

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

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

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

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

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

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

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

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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