12-21=-9

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Solution for 12-21=-9 equation: 


Simplifying
12 + -21 = -9

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

Add '9' to each side of the equation.
-9 + 9 = -9 + 9

Combine like terms: -9 + 9 = 0
0 = -9 + 9

Combine like terms: -9 + 9 = 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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