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-69=1-7n
We move all terms to the left:
-69-(1-7n)=0
We add all the numbers together, and all the variables
-(-7n+1)-69=0
We get rid of parentheses
7n-1-69=0
We add all the numbers together, and all the variables
7n-70=0
We move all terms containing n to the left, all other terms to the right
7n=70
n=70/7
n=10
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