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5r-7=r+4r
We move all terms to the left:
5r-7-(r+4r)=0
We add all the numbers together, and all the variables
5r-(+5r)-7=0
We get rid of parentheses
5r-5r-7=0
We add all the numbers together, and all the variables
-7!=0
There is no solution for this equation
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