-3a+9+7a=9a-2a

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Solution for -3a+9+7a=9a-2a equation:


Simplifying
-3a + 9 + 7a = 9a + -2a

Reorder the terms:
9 + -3a + 7a = 9a + -2a

Combine like terms: -3a + 7a = 4a
9 + 4a = 9a + -2a

Combine like terms: 9a + -2a = 7a
9 + 4a = 7a

Solving
9 + 4a = 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
9 + 4a + -7a = 7a + -7a

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

Combine like terms: 7a + -7a = 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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