-21+x=x+12

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Solution for -21+x=x+12 equation: 


Simplifying
-21 + x = x + 12

Reorder the terms:
-21 + x = 12 + x

Add '-1x' to each side of the equation.
-21 + x + -1x = 12 + x + -1x

Combine like terms: x + -1x = 0
-21 + 0 = 12 + x + -1x
-21 = 12 + x + -1x

Combine like terms: x + -1x = 0
-21 = 12 + 0
-21 = 12

Solving
-21 = 12

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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