3x-12=9-x

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


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

Reorder the terms:
-12 + 3x = 9 + -1x

Solving
-12 + 3x = 9 + -1x

Solving for variable 'x'.

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

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

Combine like terms: 3x + x = 4x
-12 + 4x = 9 + -1x + x

Combine like terms: -1x + x = 0
-12 + 4x = 9 + 0
-12 + 4x = 9

Add '12' to each side of the equation.
-12 + 12 + 4x = 9 + 12

Combine like terms: -12 + 12 = 0
0 + 4x = 9 + 12
4x = 9 + 12

Combine like terms: 9 + 12 = 21
4x = 21

Divide each side by '4'.
x = 5.25

Simplifying
x = 5.25

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