4-4=9x+3x

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


Simplifying
4 + -4 = 9x + 3x

Combine like terms: 4 + -4 = 0
0 = 9x + 3x

Combine like terms: 9x + 3x = 12x
0 = 12x

Solving
0 = 12x

Solving for variable 'x'.

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

Add '-12x' to each side of the equation.
0 + -12x = 12x + -12x
Remove the zero:
-12x = 12x + -12x

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

Divide each side by '-12'.
x = 0

Simplifying
x = 0

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