12-3x=4x-9

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


Simplifying
12 + -3x = 4x + -9

Reorder the terms:
12 + -3x = -9 + 4x

Solving
12 + -3x = -9 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
12 + -3x + -4x = -9 + 4x + -4x

Combine like terms: -3x + -4x = -7x
12 + -7x = -9 + 4x + -4x

Combine like terms: 4x + -4x = 0
12 + -7x = -9 + 0
12 + -7x = -9

Add '-12' to each side of the equation.
12 + -12 + -7x = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -7x = -9 + -12
-7x = -9 + -12

Combine like terms: -9 + -12 = -21
-7x = -21

Divide each side by '-7'.
x = 3

Simplifying
x = 3

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