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7(-6+7x)=-91
We simplify the equation to the form, which is simple to understand
7(-6+7x)=-91
Reorder the terms in parentheses
+(-42+49x)=-91
Remove unnecessary parentheses
-42+49x=-91
We move all terms containing x to the left and all other terms to the right.
+49x=-91+42
We simplify left and right side of the equation.
+49x=-49
We divide both sides of the equation by 49 to get x.
x=-1
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