x-x+15=21

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Solution for x-x+15=21 equation: 


Simplifying
x + -1x + 15 = 21

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

Combine like terms: x + -1x = 0
15 + 0 = 21
15 = 21

Solving
15 = 21

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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