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75=9-7n
We move all terms to the left:
75-(9-7n)=0
We add all the numbers together, and all the variables
-(-7n+9)+75=0
We get rid of parentheses
7n-9+75=0
We add all the numbers together, and all the variables
7n+66=0
We move all terms containing n to the left, all other terms to the right
7n=-66
n=-66/7
n=-9+3/7
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