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19=n/2-15
We move all terms to the left:
19-(n/2-15)=0
We get rid of parentheses
-n/2+15+19=0
We multiply all the terms by the denominator
-n+15*2+19*2=0
We add all the numbers together, and all the variables
-1n+68=0
We move all terms containing n to the left, all other terms to the right
-n=-68
n=-68/-1
n=+68
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