15-(-21)=

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Solution for 15-(-21)= equation: 


Simplifying
15 + -1(-21) = 0

Multiply -1 * -21
15 + 21 = 0

Combine like terms: 15 + 21 = 36
36 = 0

Solving
36 = 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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