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57.5=20+0.24r
We move all terms to the left:
57.5-(20+0.24r)=0
We add all the numbers together, and all the variables
-(0.24r+20)+57.5=0
We get rid of parentheses
-0.24r-20+57.5=0
We add all the numbers together, and all the variables
-0.24r+37.5=0
We move all terms containing r to the left, all other terms to the right
-0.24r=-37.5
r=-37.5/-0.24
r=156+0.060000000000002/0.24
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