3a-12-9a=12

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


Simplifying
3a + -12 + -9a = 12

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

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

Solving
-12 + -6a = 12

Solving for variable 'a'.

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

Add '12' to each side of the equation.
-12 + 12 + -6a = 12 + 12

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

Combine like terms: 12 + 12 = 24
-6a = 24

Divide each side by '-6'.
a = -4

Simplifying
a = -4

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