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50=n/2+40
We move all terms to the left:
50-(n/2+40)=0
We get rid of parentheses
-n/2-40+50=0
We multiply all the terms by the denominator
-n-40*2+50*2=0
We add all the numbers together, and all the variables
-1n+20=0
We move all terms containing n to the left, all other terms to the right
-n=-20
n=-20/-1
n=+20
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