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11-0.5(r-15)=0.8(5r-15)
We simplify the equation to the form, which is simple to understand
11-0.5(r-15)=0.8(5r-15)
Reorder the terms in parentheses
11+(-0.5r+7.5)=0.8*(5r-15)
Remove unnecessary parentheses
+11-0.5r+7.5=0.8+*(+5r-15+)
Reorder the terms in parentheses
11-0.5r+7.5=+(+4r-12)
Remove unnecessary parentheses
+11-0.5r+7.5=+4r-12
We move all terms containing r to the left and all other terms to the right.
-0.5r-4r=-12-11-7.5
We simplify left and right side of the equation.
-4.5r=-30.5
We divide both sides of the equation by -4.5 to get r.
r=6.77777777778
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