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D( x )
(20*y^0*x^7)/(4*x) = 0
4*x = 0
(20*y^0*x^7)/(4*x) = 0
(20*y^0*x^7)/(4*x) = 0
(20*x^7)/(4*x) = 0
5*x^6 = 0 // : 5
x^6 = 0
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
((20*y^0*x^7)/(4*x))^-2 = 0
((20*x^7)/(4*x))^-2 = 0
1/25*x^-12 = 0 // : 1/25
x^-12 = 0
x należy do O
x belongs to the empty set
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