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-3(2x-12)+4x-3=21
We simplify the equation to the form, which is simple to understand
-3(2x-12)+4x-3=21
Reorder the terms in parentheses
+(-6x+36)+4x-3=21
Remove unnecessary parentheses
-6x+36+4x-3=+21
We move all terms containing x to the left and all other terms to the right.
-6x+4x=+21-36+3
We simplify left and right side of the equation.
-2x=-12
We divide both sides of the equation by -2 to get x.
x=6
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