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6n-n=-9-4n
We move all terms to the left:
6n-n-(-9-4n)=0
We add all the numbers together, and all the variables
6n-n-(-4n-9)=0
We add all the numbers together, and all the variables
5n-(-4n-9)=0
We get rid of parentheses
5n+4n+9=0
We add all the numbers together, and all the variables
9n+9=0
We move all terms containing n to the left, all other terms to the right
9n=-9
n=-9/9
n=-1
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