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6(3+6r)+1=199
We move all terms to the left:
6(3+6r)+1-(199)=0
We add all the numbers together, and all the variables
6(6r+3)+1-199=0
We add all the numbers together, and all the variables
6(6r+3)-198=0
We multiply parentheses
36r+18-198=0
We add all the numbers together, and all the variables
36r-180=0
We move all terms containing r to the left, all other terms to the right
36r=180
r=180/36
r=5
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