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12+12x-x=9x+6
We simplify the equation to the form, which is simple to understand
12+12x-x=9x+6
We move all terms containing x to the left and all other terms to the right.
+12x-1x-9x=+6-12
We simplify left and right side of the equation.
+2x=-6
We divide both sides of the equation by 2 to get x.
x=-3
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