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-19n+20=-20-4n-19n
We move all terms to the left:
-19n+20-(-20-4n-19n)=0
We add all the numbers together, and all the variables
-19n-(-23n-20)+20=0
We get rid of parentheses
-19n+23n+20+20=0
We add all the numbers together, and all the variables
4n+40=0
We move all terms containing n to the left, all other terms to the right
4n=-40
n=-40/4
n=-10
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