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12/4=3x+2(-3x)
We simplify the equation to the form, which is simple to understand
12/4=3x+2(-3x)
Reorder the terms in parentheses
+3=3x+(-6x)
Remove unnecessary parentheses
+3=+3x-6x
We move all terms containing x to the left and all other terms to the right.
-3x+6x=-3
We simplify left and right side of the equation.
+3x=-3
We divide both sides of the equation by 3 to get x.
x=-1
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