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-3r+16=15r-8
We move all terms to the left:
-3r+16-(15r-8)=0
We get rid of parentheses
-3r-15r+8+16=0
We add all the numbers together, and all the variables
-18r+24=0
We move all terms containing r to the left, all other terms to the right
-18r=-24
r=-24/-18
r=1+1/3
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