7-15+20=

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Solution for 7-15+20= equation: 


Simplifying
7 + -15 + 20 = 0

Combine like terms: 7 + -15 = -8
-8 + 20 = 0

Combine like terms: -8 + 20 = 12
12 = 0

Solving
12 = 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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