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20=r/8+18
We move all terms to the left:
20-(r/8+18)=0
We get rid of parentheses
-r/8-18+20=0
We multiply all the terms by the denominator
-r-18*8+20*8=0
We add all the numbers together, and all the variables
-1r+16=0
We move all terms containing r to the left, all other terms to the right
-r=-16
r=-16/-1
r=+16
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