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71=9r+17
We move all terms to the left:
71-(9r+17)=0
We get rid of parentheses
-9r-17+71=0
We add all the numbers together, and all the variables
-9r+54=0
We move all terms containing r to the left, all other terms to the right
-9r=-54
r=-54/-9
r=+6
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