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-17+6r+16r+17r-19r=12
We move all terms to the left:
-17+6r+16r+17r-19r-(12)=0
We add all the numbers together, and all the variables
20r-29=0
We move all terms containing r to the left, all other terms to the right
20r=29
r=29/20
r=1+9/20
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