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6+3(6n-7)=-159
We move all terms to the left:
6+3(6n-7)-(-159)=0
We add all the numbers together, and all the variables
3(6n-7)+165=0
We multiply parentheses
18n-21+165=0
We add all the numbers together, and all the variables
18n+144=0
We move all terms containing n to the left, all other terms to the right
18n=-144
n=-144/18
n=-8
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