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6(1-7n)=90
We move all terms to the left:
6(1-7n)-(90)=0
We add all the numbers together, and all the variables
6(-7n+1)-90=0
We multiply parentheses
-42n+6-90=0
We add all the numbers together, and all the variables
-42n-84=0
We move all terms containing n to the left, all other terms to the right
-42n=84
n=84/-42
n=-2
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