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D( x )
3*x^7 = 0
x-2 = 0
9*x^5 = 0
3*x^7 = 0
3*x^7 = 0
3*x^7 = 0 // : 3
x^7 = 0
x = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
9*x^5 = 0
9*x^5 = 0
9*x^5 = 0 // : 9
x^5 = 0
x = 0
x in (-oo:0) U (0:2) U (2:+oo)
((4/(3*x^7))/(x-2))/(9*x^5) = 0
(4/3*x^-7)/(9*x^5*(x-2)) = 0
4/3*x^-7 = 0 // : 4/3
x^-7 = 0
x należy do O
x belongs to the empty set
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