21-(-7)=

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Solution for 21-(-7)= equation: 


Simplifying
21 + -1(-7) = 0

Multiply -1 * -7
21 + 7 = 0

Combine like terms: 21 + 7 = 28
28 = 0

Solving
28 = 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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