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(9r-1)+55=180
We move all terms to the left:
(9r-1)+55-(180)=0
We add all the numbers together, and all the variables
(9r-1)-125=0
We get rid of parentheses
9r-1-125=0
We add all the numbers together, and all the variables
9r-126=0
We move all terms containing r to the left, all other terms to the right
9r=126
r=126/9
r=14
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