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D( j )
5*j+4 = 0
5*j+4 = 0
5*j+4 = 0
5*j+4 = 0 // - 4
5*j = -4 // : 5
j = -4/5
j in (-oo:-4/5) U (-4/5:+oo)
(5*e^2*j)/(5*j+4) = 0
5*e^2*j = 0 // : 5*e^2
j = 0
j = 0
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