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-12(-1)=-9(1+7x)
We simplify the equation to the form, which is simple to understand
-12(-1)=-9(1+7x)
Reorder the terms in parentheses
+(+12)=-9*(1+7x)
Remove unnecessary parentheses
+12=-9+*(+1+7x+)
Reorder the terms in parentheses
+12=+(-9-63x)
Remove unnecessary parentheses
+12=-9-63x
We move all terms containing x to the left and all other terms to the right.
+63x=-9-12
We simplify left and right side of the equation.
+63x=-21
We divide both sides of the equation by 063 to get x.
x=-0.333333333333
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