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15.9r=15.7r-3.1
We move all terms to the left:
15.9r-(15.7r-3.1)=0
We get rid of parentheses
15.9r-15.7r+3.1=0
We add all the numbers together, and all the variables
0.2r+3.1=0
We move all terms containing r to the left, all other terms to the right
0.2r=-3.1
r=-3.1/0.2
r=-15+0.1/0.2
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