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6=r/20-6
We move all terms to the left:
6-(r/20-6)=0
We get rid of parentheses
-r/20+6+6=0
We multiply all the terms by the denominator
-r+6*20+6*20=0
We add all the numbers together, and all the variables
-1r+240=0
We move all terms containing r to the left, all other terms to the right
-r=-240
r=-240/-1
r=+240
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