-3a+12+5a=9a-4a

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Solution for -3a+12+5a=9a-4a equation:


Simplifying
-3a + 12 + 5a = 9a + -4a

Reorder the terms:
12 + -3a + 5a = 9a + -4a

Combine like terms: -3a + 5a = 2a
12 + 2a = 9a + -4a

Combine like terms: 9a + -4a = 5a
12 + 2a = 5a

Solving
12 + 2a = 5a

Solving for variable 'a'.

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

Add '-5a' to each side of the equation.
12 + 2a + -5a = 5a + -5a

Combine like terms: 2a + -5a = -3a
12 + -3a = 5a + -5a

Combine like terms: 5a + -5a = 0
12 + -3a = 0

Add '-12' to each side of the equation.
12 + -12 + -3a = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -3a = 0 + -12
-3a = 0 + -12

Combine like terms: 0 + -12 = -12
-3a = -12

Divide each side by '-3'.
a = 4

Simplifying
a = 4

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