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2(3n-6)=18
We move all terms to the left:
2(3n-6)-(18)=0
We multiply parentheses
6n-12-18=0
We add all the numbers together, and all the variables
6n-30=0
We move all terms containing n to the left, all other terms to the right
6n=30
n=30/6
n=5
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