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D( X )
e^7.6 = 0
e^7.6 = 0
e^7.6 = 0
e^7.6 = 0
X belongs to the empty set
X in (-oo:+oo)
X = (e^9.8)/(e^7.6) // - (e^9.8)/(e^7.6)
X-((e^9.8)/(e^7.6)) = 0
X-e^2.2 = 0
X-e^2.2 = 0 // + e^2.2
X = e^2.2
X = e^2.2
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