3x-9=(12+x)

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


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

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

Remove parenthesis around (12 + x)
-9 + 3x = 12 + x

Solving
-9 + 3x = 12 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
-9 + 3x + -1x = 12 + x + -1x

Combine like terms: 3x + -1x = 2x
-9 + 2x = 12 + x + -1x

Combine like terms: x + -1x = 0
-9 + 2x = 12 + 0
-9 + 2x = 12

Add '9' to each side of the equation.
-9 + 9 + 2x = 12 + 9

Combine like terms: -9 + 9 = 0
0 + 2x = 12 + 9
2x = 12 + 9

Combine like terms: 12 + 9 = 21
2x = 21

Divide each side by '2'.
x = 10.5

Simplifying
x = 10.5

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