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35=3r-7
We move all terms to the left:
35-(3r-7)=0
We get rid of parentheses
-3r+7+35=0
We add all the numbers together, and all the variables
-3r+42=0
We move all terms containing r to the left, all other terms to the right
-3r=-42
r=-42/-3
r=+14
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