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-3.7+3r=0.2
We move all terms to the left:
-3.7+3r-(0.2)=0
We add all the numbers together, and all the variables
3r-3.9=0
We move all terms containing r to the left, all other terms to the right
3r=3.9
r=3.9/3
r=1+0.9/3
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