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-9-3n=n+1+n
We move all terms to the left:
-9-3n-(n+1+n)=0
We add all the numbers together, and all the variables
-3n-(2n+1)-9=0
We get rid of parentheses
-3n-2n-1-9=0
We add all the numbers together, and all the variables
-5n-10=0
We move all terms containing n to the left, all other terms to the right
-5n=10
n=10/-5
n=-2
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