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2(3n-1)=136
We move all terms to the left:
2(3n-1)-(136)=0
We multiply parentheses
6n-2-136=0
We add all the numbers together, and all the variables
6n-138=0
We move all terms containing n to the left, all other terms to the right
6n=138
n=138/6
n=23
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