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D( x )
e^2 = 0
e^2 = 0
e^2 = 0
e^2 = 0
x belongs to the empty set
x in (-oo:+oo)
(1/(e^2))*x = 13 // - 13
(1/(e^2))*x-13 = 0
(1/(e^2))*x-13 = 0 // + 13
(1/(e^2))*x = 13 // : 1/(e^2)
x = 13/(1/(e^2))
x = 13*e^2
x = 13*e^2
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