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7(r-5)=-91
We simplify the equation to the form, which is simple to understand
7(r-5)=-91
Reorder the terms in parentheses
+(+7r-35)=-91
Remove unnecessary parentheses
+7r-35=-91
We move all terms containing r to the left and all other terms to the right.
+7r=-91+35
We simplify left and right side of the equation.
+7r=-56
We divide both sides of the equation by 7 to get r.
r=-8
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