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-217r=-16-2r-16r
We move all terms to the left:
-217r-(-16-2r-16r)=0
We add all the numbers together, and all the variables
-217r-(-18r-16)=0
We get rid of parentheses
-217r+18r+16=0
We add all the numbers together, and all the variables
-199r+16=0
We move all terms containing r to the left, all other terms to the right
-199r=-16
r=-16/-199
r=16/199
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