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x in (-oo:+oo)
N = (t^1-t^2)/(t^1) // - (t^1-t^2)/(t^1)
N-((t^1-t^2)/(t^1)) = 0
N-((t-t^2)/t) = 0
(-1*(t-t^2))/t+N = 0
(-1*(t-t^2))/t+(N*t)/t = 0
N*t-1*(t-t^2) = 0
t^2-t+N*t = 0
(t^2-t+N*t)/t = 0
(t^2-t+N*t)/t = 0 // * t
t^2-t+N*t = 0
x belongs to the empty set
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