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-4r-1=3r+13
We move all terms to the left:
-4r-1-(3r+13)=0
We get rid of parentheses
-4r-3r-13-1=0
We add all the numbers together, and all the variables
-7r-14=0
We move all terms containing r to the left, all other terms to the right
-7r=14
r=14/-7
r=-2
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