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2.5r=2r+30
We move all terms to the left:
2.5r-(2r+30)=0
We get rid of parentheses
2.5r-2r-30=0
We add all the numbers together, and all the variables
0.5r-30=0
We move all terms containing r to the left, all other terms to the right
0.5r=30
r=30/0.5
r=60
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