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6r+1=4r-9
We move all terms to the left:
6r+1-(4r-9)=0
We get rid of parentheses
6r-4r+9+1=0
We add all the numbers together, and all the variables
2r+10=0
We move all terms containing r to the left, all other terms to the right
2r=-10
r=-10/2
r=-5
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