-15-20=-42+7

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Solution for -15-20=-42+7 equation: 


Simplifying
-15 + -20 = -42 + 7

Combine like terms: -15 + -20 = -35
-35 = -42 + 7

Combine like terms: -42 + 7 = -35
-35 = -35

Add '35' to each side of the equation.
-35 + 35 = -35 + 35

Combine like terms: -35 + 35 = 0
0 = -35 + 35

Combine like terms: -35 + 35 = 0
0 = 0

Solving
0 = 0

Couldn't find a variable to solve for.

This equation is an identity, all real numbers are solutions.

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