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6(5r-2)=198
We move all terms to the left:
6(5r-2)-(198)=0
We multiply parentheses
30r-12-198=0
We add all the numbers together, and all the variables
30r-210=0
We move all terms containing r to the left, all other terms to the right
30r=210
r=210/30
r=7
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