9a+3a=12a

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Solution for 9a+3a=12a equation: 


Simplifying
9a + 3a = 12a

Combine like terms: 9a + 3a = 12a
12a = 12a

Add '-12a' to each side of the equation.
12a + -12a = 12a + -12a

Combine like terms: 12a + -12a = 0
0 = 12a + -12a

Combine like terms: 12a + -12a = 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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