-3+5-12=15

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Solution for -3+5-12=15 equation: 


Simplifying
-3 + 5 + -12 = 15

Combine like terms: -3 + 5 = 2
2 + -12 = 15

Combine like terms: 2 + -12 = -10
-10 = 15

Solving
-10 = 15

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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