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30r-48=7r-25
We move all terms to the left:
30r-48-(7r-25)=0
We get rid of parentheses
30r-7r+25-48=0
We add all the numbers together, and all the variables
23r-23=0
We move all terms containing r to the left, all other terms to the right
23r=23
r=23/23
r=1
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