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12x-9(-6)=6
We simplify the equation to the form, which is simple to understand
12x-9(-6)=6
Reorder the terms in parentheses
12x+(+54)=6
Remove unnecessary parentheses
+12x+54=+6
We move all terms containing x to the left and all other terms to the right.
+12x=+6-54
We simplify left and right side of the equation.
+12x=-48
We divide both sides of the equation by 12 to get x.
x=-4