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x in (-oo:+oo)
C = (15*n+400)/n // - (15*n+400)/n
C-((15*n+400)/n) = 0
(-1*(15*n+400))/n+C = 0
(-1*(15*n+400))/n+(C*n)/n = 0
C*n-1*(15*n+400) = 0
C*n-15*n-400 = 0
(C*n-15*n-400)/n = 0
(C*n-15*n-400)/n = 0 // * n
C*n-15*n-400 = 0
x belongs to the empty set
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