-21=9a-15-9a

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Solution for -21=9a-15-9a equation: 


Simplifying
-21 = 9a + -15 + -9a

Reorder the terms:
-21 = -15 + 9a + -9a

Combine like terms: 9a + -9a = 0
-21 = -15 + 0
-21 = -15

Solving
-21 = -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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