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3.5r=1.5r+40
We move all terms to the left:
3.5r-(1.5r+40)=0
We get rid of parentheses
3.5r-1.5r-40=0
We add all the numbers together, and all the variables
2r-40=0
We move all terms containing r to the left, all other terms to the right
2r=40
r=40/2
r=20
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