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54=-3+3r
We move all terms to the left:
54-(-3+3r)=0
We add all the numbers together, and all the variables
-(3r-3)+54=0
We get rid of parentheses
-3r+3+54=0
We add all the numbers together, and all the variables
-3r+57=0
We move all terms containing r to the left, all other terms to the right
-3r=-57
r=-57/-3
r=+19
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