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42=16r-18-14r
We move all terms to the left:
42-(16r-18-14r)=0
We add all the numbers together, and all the variables
-(2r-18)+42=0
We get rid of parentheses
-2r+18+42=0
We add all the numbers together, and all the variables
-2r+60=0
We move all terms containing r to the left, all other terms to the right
-2r=-60
r=-60/-2
r=+30
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