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-6x+3(4x+3)=-99
We simplify the equation to the form, which is simple to understand
-6x+3(4x+3)=-99
Reorder the terms in parentheses
-6x+(+12x+9)=-99
Remove unnecessary parentheses
-6x+12x+9=-99
We move all terms containing x to the left and all other terms to the right.
-6x+12x=-99-9
We simplify left and right side of the equation.
+6x=-108
We divide both sides of the equation by 6 to get x.
x=-18
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