21=6-(-7)

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Solution for 21=6-(-7) equation: 


Simplifying
21 = 6 + -1(-7)

Multiply -1 * -7
21 = 6 + 7

Combine like terms: 6 + 7 = 13
21 = 13

Solving
21 = 13

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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