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