3x+9+3x+9=9x-12

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Solution for 3x+9+3x+9=9x-12 equation:


Simplifying
3x + 9 + 3x + 9 = 9x + -12

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

Combine like terms: 9 + 9 = 18
18 + 3x + 3x = 9x + -12

Combine like terms: 3x + 3x = 6x
18 + 6x = 9x + -12

Reorder the terms:
18 + 6x = -12 + 9x

Solving
18 + 6x = -12 + 9x

Solving for variable 'x'.

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

Add '-9x' to each side of the equation.
18 + 6x + -9x = -12 + 9x + -9x

Combine like terms: 6x + -9x = -3x
18 + -3x = -12 + 9x + -9x

Combine like terms: 9x + -9x = 0
18 + -3x = -12 + 0
18 + -3x = -12

Add '-18' to each side of the equation.
18 + -18 + -3x = -12 + -18

Combine like terms: 18 + -18 = 0
0 + -3x = -12 + -18
-3x = -12 + -18

Combine like terms: -12 + -18 = -30
-3x = -30

Divide each side by '-3'.
x = 10

Simplifying
x = 10

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