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16-2r=13r+1
We move all terms to the left:
16-2r-(13r+1)=0
We get rid of parentheses
-2r-13r-1+16=0
We add all the numbers together, and all the variables
-15r+15=0
We move all terms containing r to the left, all other terms to the right
-15r=-15
r=-15/-15
r=1
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