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2n-3n+9=-4n
We move all terms to the left:
2n-3n+9-(-4n)=0
We add all the numbers together, and all the variables
-1n-(-4n)+9=0
We get rid of parentheses
-1n+4n+9=0
We add all the numbers together, and all the variables
3n+9=0
We move all terms containing n to the left, all other terms to the right
3n=-9
n=-9/3
n=-3
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