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-5(r+7)=-87
We simplify the equation to the form, which is simple to understand
-5(r+7)=-87
Reorder the terms in parentheses
+(-5r-35)=-87
Remove unnecessary parentheses
-5r-35=-87
We move all terms containing r to the left and all other terms to the right.
-5r=-87+35
We simplify left and right side of the equation.
-5r=-52
We divide both sides of the equation by -5 to get r.
r=10.4
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