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5r-13-6r=3r+15-16
We move all terms to the left:
5r-13-6r-(3r+15-16)=0
We add all the numbers together, and all the variables
5r-6r-(3r-1)-13=0
We add all the numbers together, and all the variables
-1r-(3r-1)-13=0
We get rid of parentheses
-1r-3r+1-13=0
We add all the numbers together, and all the variables
-4r-12=0
We move all terms containing r to the left, all other terms to the right
-4r=12
r=12/-4
r=-3
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