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