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5r+5(10r-7)=0
We simplify the equation to the form, which is simple to understand
5r+5(10r-7)=0
Reorder the terms in parentheses
5r+(+50r-35)=0
Remove unnecessary parentheses
+5r+50r-35=0
We move all terms containing r to the left and all other terms to the right.
+5r+50r=0+35
We simplify left and right side of the equation.
+55r=+35
We divide both sides of the equation by 55 to get r.
r=0.63636363636364
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