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4r=25-3r
We move all terms to the left:
4r-(25-3r)=0
We add all the numbers together, and all the variables
4r-(-3r+25)=0
We get rid of parentheses
4r+3r-25=0
We add all the numbers together, and all the variables
7r-25=0
We move all terms containing r to the left, all other terms to the right
7r=25
r=25/7
r=3+4/7
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