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n/2(1000+(n-1)*40)=n/2(800+(n-1)*60)
We move all terms to the left:
n/2(1000+(n-1)*40)-(n/2(800+(n-1)*60))=0
Domain of the equation: 2(1000+(n-1)*40)!=0
n∈R
Domain of the equation: 2(800+(n-1)*60))!=0We calculate fractions
n∈R
We do not support enpression: n^3(8
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