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35=15-r
We move all terms to the left:
35-(15-r)=0
We add all the numbers together, and all the variables
-(-1r+15)+35=0
We get rid of parentheses
1r-15+35=0
We add all the numbers together, and all the variables
r+20=0
We move all terms containing r to the left, all other terms to the right
r=-20
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