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5(5r-1)+5r=235
We move all terms to the left:
5(5r-1)+5r-(235)=0
We add all the numbers together, and all the variables
5r+5(5r-1)-235=0
We multiply parentheses
5r+25r-5-235=0
We add all the numbers together, and all the variables
30r-240=0
We move all terms containing r to the left, all other terms to the right
30r=240
r=240/30
r=8
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