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50(6=r)=475
We move all terms to the left:
50(6-(r))=0
We add all the numbers together, and all the variables
50(-1r+6)=0
We multiply parentheses
-50r+300=0
We move all terms containing r to the left, all other terms to the right
-50r=-300
r=-300/-50
r=+6
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