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2.35=r-20
We move all terms to the left:
2.35-(r-20)=0
We get rid of parentheses
-r+20+2.35=0
We add all the numbers together, and all the variables
-1r+22.35=0
We move all terms containing r to the left, all other terms to the right
-r=-22.35
r=-22.35/-1
r=22+0.35/1
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