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