12a+9a=3a

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


Simplifying
12a + 9a = 3a

Combine like terms: 12a + 9a = 21a
21a = 3a

Solving
21a = 3a

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

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

Combine like terms: 21a + -3a = 18a
18a = 3a + -3a

Combine like terms: 3a + -3a = 0
18a = 0

Divide each side by '18'.
a = 0

Simplifying
a = 0

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