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20=r-752/8
We move all terms to the left:
20-(r-752/8)=0
We add all the numbers together, and all the variables
-(r-94)+20=0
We get rid of parentheses
-r+94+20=0
We add all the numbers together, and all the variables
-1r+114=0
We move all terms containing r to the left, all other terms to the right
-r=-114
r=-114/-1
r=+114
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