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r-17=-1+12+3r
We move all terms to the left:
r-17-(-1+12+3r)=0
We add all the numbers together, and all the variables
r-(3r+11)-17=0
We get rid of parentheses
r-3r-11-17=0
We add all the numbers together, and all the variables
-2r-28=0
We move all terms containing r to the left, all other terms to the right
-2r=28
r=28/-2
r=-14
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