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3n-9=4+7n-1
We move all terms to the left:
3n-9-(4+7n-1)=0
We add all the numbers together, and all the variables
3n-(7n+3)-9=0
We get rid of parentheses
3n-7n-3-9=0
We add all the numbers together, and all the variables
-4n-12=0
We move all terms containing n to the left, all other terms to the right
-4n=12
n=12/-4
n=-3
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