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12+12x+12-6x+12=0
We simplify the equation to the form, which is simple to understand
12+12x+12-6x+12=0
We move all terms containing x to the left and all other terms to the right.
+12x-6x=0-12-12-12
We simplify left and right side of the equation.
+6x=-36
We divide both sides of the equation by 6 to get x.
x=-6
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