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3(6-7x)-7x=130
We simplify the equation to the form, which is simple to understand
3(6-7x)-7x=130
Reorder the terms in parentheses
+(+18-21x)-7x=130
Remove unnecessary parentheses
+18-21x-7x=+130
We move all terms containing x to the left and all other terms to the right.
-21x-7x=+130-18
We simplify left and right side of the equation.
-28x=+112
We divide both sides of the equation by -28 to get x.
x=-4
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