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12-9x=-42-3x
We simplify the equation to the form, which is simple to understand
12-9x=-42-3x
We move all terms containing x to the left and all other terms to the right.
-9x+3x=-42-12
We simplify left and right side of the equation.
-6x=-54
We divide both sides of the equation by -6 to get x.
x=9
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