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20-0.4n=3.2*
We move all terms to the left:
20-0.4n-(3.2*)=0
We add all the numbers together, and all the variables
-0.4n+20-0=0
We add all the numbers together, and all the variables
-0.4n+20=0
We move all terms containing n to the left, all other terms to the right
-0.4n=-20
n=-20/-0.4
n=+50
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