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9-4x=3x-12
We simplify the equation to the form, which is simple to understand
9-4x=3x-12
We move all terms containing x to the left and all other terms to the right.
-4x-3x=-12-9
We simplify left and right side of the equation.
-7x=-21
We divide both sides of the equation by -7 to get x.
x=3
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