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7(-12+r)=91
We simplify the equation to the form, which is simple to understand
7(-12+r)=91
Reorder the terms in parentheses
+(-84+7r)=91
Remove unnecessary parentheses
-84+7r=+91
We move all terms containing r to the left and all other terms to the right.
+7r=+91+84
We simplify left and right side of the equation.
+7r=+175
We divide both sides of the equation by 7 to get r.
r=25
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