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-12(-12)=-9(1+7x)
We simplify the equation to the form, which is simple to understand
-12(-12)=-9(1+7x)
Reorder the terms in parentheses
+(+144)=-9*(1+7x)
Remove unnecessary parentheses
+144=-9+*(+1+7x+)
Reorder the terms in parentheses
+144=+(-9-63x)
Remove unnecessary parentheses
+144=-9-63x
We move all terms containing x to the left and all other terms to the right.
+63x=-9-144
We simplify left and right side of the equation.
+63x=-153
We divide both sides of the equation by 063 to get x.
x=-2.42857142857
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