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