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2/5n+1/10=1/2(n+9)
We move all terms to the left:
2/5n+1/10-(1/2(n+9))=0
Domain of the equation: 5n!=0
n!=0/5
n!=0
n∈R
Domain of the equation: 2(n+9))!=0We calculate fractions
n∈R
(40nn/(100n^2n+(-(1*5n*10)/(100n^2n+20n^2/(100n^2n=0
We can not solve this equation
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