21-(-56)=

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Solution for 21-(-56)= equation: 


Simplifying
21 + -1(-56) = 0

Multiply -1 * -56
21 + 56 = 0

Combine like terms: 21 + 56 = 77
77 = 0

Solving
77 = 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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