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6(6r-1)-4r=186
We move all terms to the left:
6(6r-1)-4r-(186)=0
We add all the numbers together, and all the variables
-4r+6(6r-1)-186=0
We multiply parentheses
-4r+36r-6-186=0
We add all the numbers together, and all the variables
32r-192=0
We move all terms containing r to the left, all other terms to the right
32r=192
r=192/32
r=6
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