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