3a-21=-9+3a

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Solution for 3a-21=-9+3a equation: 


Simplifying
3a + -21 = -9 + 3a

Reorder the terms:
-21 + 3a = -9 + 3a

Add '-3a' to each side of the equation.
-21 + 3a + -3a = -9 + 3a + -3a

Combine like terms: 3a + -3a = 0
-21 + 0 = -9 + 3a + -3a
-21 = -9 + 3a + -3a

Combine like terms: 3a + -3a = 0
-21 = -9 + 0
-21 = -9

Solving
-21 = -9

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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