-3a+9+9a=7a-4a

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Solution for -3a+9+9a=7a-4a equation:


Simplifying
-3a + 9 + 9a = 7a + -4a

Reorder the terms:
9 + -3a + 9a = 7a + -4a

Combine like terms: -3a + 9a = 6a
9 + 6a = 7a + -4a

Combine like terms: 7a + -4a = 3a
9 + 6a = 3a

Solving
9 + 6a = 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.
9 + 6a + -3a = 3a + -3a

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

Combine like terms: 3a + -3a = 0
9 + 3a = 0

Add '-9' to each side of the equation.
9 + -9 + 3a = 0 + -9

Combine like terms: 9 + -9 = 0
0 + 3a = 0 + -9
3a = 0 + -9

Combine like terms: 0 + -9 = -9
3a = -9

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

Simplifying
a = -3

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