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18x-3(12x-21)=-36
We simplify the equation to the form, which is simple to understand
18x-3(12x-21)=-36
Reorder the terms in parentheses
18x+(-36x+63)=-36
Remove unnecessary parentheses
+18x-36x+63=-36
We move all terms containing x to the left and all other terms to the right.
+18x-36x=-36-63
We simplify left and right side of the equation.
-18x=-99
We divide both sides of the equation by -18 to get x.
x=5.5
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