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-57=-r+-33
We move all terms to the left:
-57-(-r+-33)=0
We add all the numbers together, and all the variables
-(-1r-33)-57=0
We get rid of parentheses
1r+33-57=0
We add all the numbers together, and all the variables
r-24=0
We move all terms containing r to the left, all other terms to the right
r=24
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