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7(-7+r)=84
We simplify the equation to the form, which is simple to understand
7(-7+r)=84
Reorder the terms in parentheses
+(-49+7r)=84
Remove unnecessary parentheses
-49+7r=+84
We move all terms containing r to the left and all other terms to the right.
+7r=+84+49
We simplify left and right side of the equation.
+7r=+133
We divide both sides of the equation by 7 to get r.
r=19
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