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200(1+3r)=30
We move all terms to the left:
200(1+3r)-(30)=0
We add all the numbers together, and all the variables
200(3r+1)-30=0
We multiply parentheses
600r+200-30=0
We add all the numbers together, and all the variables
600r+170=0
We move all terms containing r to the left, all other terms to the right
600r=-170
r=-170/600
r=-17/60
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