-12-9=4-9-7

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Solution for -12-9=4-9-7 equation: 


Simplifying
-12 + -9 = 4 + -9 + -7

Combine like terms: -12 + -9 = -21
-21 = 4 + -9 + -7

Combine like terms: 4 + -9 = -5
-21 = -5 + -7

Combine like terms: -5 + -7 = -12
-21 = -12

Solving
-21 = -12

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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