-21.5+21=

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Solution for -21.5+21= equation: 


Simplifying
-21.5 + 21 = 0

Combine like terms: -21.5 + 21 = -0.5
-0.5 = 0

Solving
-0.5 = 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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