9=12+3x-4x

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Solution for 9=12+3x-4x equation:


Simplifying
9 = 12 + 3x + -4x

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

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

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

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

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

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

Simplifying
x = 3

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