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