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6(11+r)=54
We move all terms to the left:
6(11+r)-(54)=0
We add all the numbers together, and all the variables
6(r+11)-54=0
We multiply parentheses
6r+66-54=0
We add all the numbers together, and all the variables
6r+12=0
We move all terms containing r to the left, all other terms to the right
6r=-12
r=-12/6
r=-2
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