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12(r-855)=624
We move all terms to the left:
12(r-855)-(624)=0
We multiply parentheses
12r-10260-624=0
We add all the numbers together, and all the variables
12r-10884=0
We move all terms containing r to the left, all other terms to the right
12r=10884
r=10884/12
r=907
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