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70=5.5r+15
We move all terms to the left:
70-(5.5r+15)=0
We get rid of parentheses
-5.5r-15+70=0
We add all the numbers together, and all the variables
-5.5r+55=0
We move all terms containing r to the left, all other terms to the right
-5.5r=-55
r=-55/-5.5
r=+10
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