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7(5+7r)=210
We simplify the equation to the form, which is simple to understand
7(5+7r)=210
Reorder the terms in parentheses
+(+35+49r)=210
Remove unnecessary parentheses
+35+49r=+210
We move all terms containing r to the left and all other terms to the right.
+49r=+210-35
We simplify left and right side of the equation.
+49r=+175
We divide both sides of the equation by 49 to get r.
r=3.57142857143
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