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6(1+8n)=-138
We move all terms to the left:
6(1+8n)-(-138)=0
We add all the numbers together, and all the variables
6(8n+1)-(-138)=0
We add all the numbers together, and all the variables
6(8n+1)+138=0
We multiply parentheses
48n+6+138=0
We add all the numbers together, and all the variables
48n+144=0
We move all terms containing n to the left, all other terms to the right
48n=-144
n=-144/48
n=-3
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