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15r-14=16r-17
We move all terms to the left:
15r-14-(16r-17)=0
We get rid of parentheses
15r-16r+17-14=0
We add all the numbers together, and all the variables
-1r+3=0
We move all terms containing r to the left, all other terms to the right
-r=-3
r=-3/-1
r=+3
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