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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 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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