x-(x-21)=72

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Solution for x-(x-21)=72 equation: 


Simplifying
x + -1(x + -21) = 72

Reorder the terms:
x + -1(-21 + x) = 72
x + (-21 * -1 + x * -1) = 72
x + (21 + -1x) = 72

Reorder the terms:
21 + x + -1x = 72

Combine like terms: x + -1x = 0
21 + 0 = 72
21 = 72

Solving
21 = 72

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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