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-(n-19)=4
We move all terms to the left:
-(n-19)-(4)=0
We get rid of parentheses
-n+19-4=0
We add all the numbers together, and all the variables
-1n+15=0
We move all terms containing n to the left, all other terms to the right
-n=-15
n=-15/-1
n=+15
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