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3r-10=r+15
We move all terms to the left:
3r-10-(r+15)=0
We get rid of parentheses
3r-r-15-10=0
We add all the numbers together, and all the variables
2r-25=0
We move all terms containing r to the left, all other terms to the right
2r=25
r=25/2
r=12+1/2
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