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-3(r+58)=57
We move all terms to the left:
-3(r+58)-(57)=0
We multiply parentheses
-3r-174-57=0
We add all the numbers together, and all the variables
-3r-231=0
We move all terms containing r to the left, all other terms to the right
-3r=231
r=231/-3
r=-77
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