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19+1+9n-5n=10n+4n
We move all terms to the left:
19+1+9n-5n-(10n+4n)=0
We add all the numbers together, and all the variables
9n-5n-(+14n)+19+1=0
We add all the numbers together, and all the variables
4n-(+14n)+20=0
We get rid of parentheses
4n-14n+20=0
We add all the numbers together, and all the variables
-10n+20=0
We move all terms containing n to the left, all other terms to the right
-10n=-20
n=-20/-10
n=+2
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