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-413.4=-15.9n=
We move all terms to the left:
-413.4-(-15.9n)=0
We get rid of parentheses
15.9n-413.4=0
We move all terms containing n to the left, all other terms to the right
15.9n=413.4
n=413.4/15.9
n=25+1/1
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