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7(4+5r)+7(r-2)=56
We simplify the equation to the form, which is simple to understand
7(4+5r)+7(r-2)=56
Reorder the terms in parentheses
+(+28+35r)+7*(r-2)=56
Remove unnecessary parentheses
+28+35r+7+*(+r-2+)=+56
Reorder the terms in parentheses
+28+35r+(+7r-14)=56
Remove unnecessary parentheses
+28+35r+7r-14=+56
We move all terms containing r to the left and all other terms to the right.
+35r+7r=+56-28+14
We simplify left and right side of the equation.
+42r=+42
We divide both sides of the equation by 42 to get r.
r=1
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