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2(r/2)+2(0.09r)=0
We simplify the equation to the form, which is simple to understand
2(r/2)+2(0.09r)=0
Reorder the terms in parentheses
+(+1r)+2*(0.09r)=0
Remove unnecessary parentheses
+1r+2+*( + 0.09r+)=0
Reorder the terms in parentheses
+1r+( + 0.18r)=0
Remove unnecessary parentheses
+1r + 0.18r=0
We move all terms containing r to the left and all other terms to the right.
+1r + 0.18r=0
We simplify left and right side of the equation.
+1.18r=0
We divide both sides of the equation by 1.18 to get r.
r=0
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