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5r+7-r=+10+2r
We move all terms to the left:
5r+7-r-(+10+2r)=0
We add all the numbers together, and all the variables
5r-r-(2r+10)+7=0
We add all the numbers together, and all the variables
4r-(2r+10)+7=0
We get rid of parentheses
4r-2r-10+7=0
We add all the numbers together, and all the variables
2r-3=0
We move all terms containing r to the left, all other terms to the right
2r=3
r=3/2
r=1+1/2
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