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