7-21=0

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Solution for 7-21=0 equation: 


Simplifying
7 + -21 = 0

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

Solving
-14 = 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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