3x-9=3(12-x)

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


Simplifying
3x + -9 = 3(12 + -1x)

Reorder the terms:
-9 + 3x = 3(12 + -1x)
-9 + 3x = (12 * 3 + -1x * 3)
-9 + 3x = (36 + -3x)

Solving
-9 + 3x = 36 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
-9 + 3x + 3x = 36 + -3x + 3x

Combine like terms: 3x + 3x = 6x
-9 + 6x = 36 + -3x + 3x

Combine like terms: -3x + 3x = 0
-9 + 6x = 36 + 0
-9 + 6x = 36

Add '9' to each side of the equation.
-9 + 9 + 6x = 36 + 9

Combine like terms: -9 + 9 = 0
0 + 6x = 36 + 9
6x = 36 + 9

Combine like terms: 36 + 9 = 45
6x = 45

Divide each side by '6'.
x = 7.5

Simplifying
x = 7.5

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