3a=9a-12

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Solution for 3a=9a-12 equation: 


Simplifying
3a = 9a + -12

Reorder the terms:
3a = -12 + 9a

Solving
3a = -12 + 9a

Solving for variable 'a'.

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

Add '-9a' to each side of the equation.
3a + -9a = -12 + 9a + -9a

Combine like terms: 3a + -9a = -6a
-6a = -12 + 9a + -9a

Combine like terms: 9a + -9a = 0
-6a = -12 + 0
-6a = -12

Divide each side by '-6'.
a = 2

Simplifying
a = 2

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