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6(5r+11)=216
We move all terms to the left:
6(5r+11)-(216)=0
We multiply parentheses
30r+66-216=0
We add all the numbers together, and all the variables
30r-150=0
We move all terms containing r to the left, all other terms to the right
30r=150
r=150/30
r=5
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