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n/2(2(40000)+(n-1)(3500))=n(2(10000)+(n-1)(2000))
We move all terms to the left:
n/2(2(40000)+(n-1)(3500))-(n(2(10000)+(n-1)(2000)))=0
Domain of the equation: 2(240000+(n-1)3500)!=0We multiply all the terms by the denominator
n∈R
n-((n(210000+(n-1)2000)))*2(240000+(n-1)3500)=0
We calculate terms in parentheses: -((n(210000+(n-1)2000)))*2(240000+(n-1)3500), so:We add all the numbers together, and all the variables
(n(210000+(n-1)2000)))*2(240000+(n-1)3500
We multiply parentheses
(n(210000+(n-1)2000)))*2(240000+3500n-3500
We add all the numbers together, and all the variables
3500n+(n(210000+(n-1)2000)))*2(240000-3500
Back to the equation:
-(3500n+(n(210000+(n-1)2000)))*2(240000-3500)
n-(3500n+(n(210000+(n-1)2000)))*2236500=0
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