7-21-7+21=

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Solution for 7-21-7+21= equation: 


Simplifying
7 + -21 + -7 + 21 = 0

Combine like terms: 7 + -21 = -14
-14 + -7 + 21 = 0

Combine like terms: -14 + -7 = -21
-21 + 21 = 0

Combine like terms: -21 + 21 = 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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