21+9x-6+(-9x)=3y-3y

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Solution for 21+9x-6+(-9x)=3y-3y equation: 


Simplifying
21 + 9x + -6 + (-9x) = 3y + -3y

Reorder the terms:
21 + -6 + 9x + (-9x) = 3y + -3y

Combine like terms: 21 + -6 = 15
15 + 9x + (-9x) = 3y + -3y

Combine like terms: 9x + (-9x) = 0
15 + 0 = 3y + -3y
15 = 3y + -3y

Combine like terms: 3y + -3y = 0
15 = 0

Solving
15 = 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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