x-21=x

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Solution for x-21=x equation: 


Simplifying
x + -21 = x

Reorder the terms:
-21 + x = x

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

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

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

Solving
-21 = 0

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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