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D( x )
x = 0
8*w^7*x^-5*y^3*z^-9 = 0
x = 0
x = 0
8*w^7*x^-5*y^3*z^-9 = 0
8*w^7*x^-5*y^3*z^-9 = 0
8*w^7*x^-5*y^3*z^-9 = 0 // : 8*w^7*y^3*z^-9
x^-5 = 0
x należy do O
x in (-oo:0) U (0:+oo)
((8*w^7*x^-5*y^3*z^-9)^-2)/3 = 0
1/192*w^-14*x^10*y^-6*z^18 = 0 // : 1/192*w^-14*y^-6*z^18
x^10 = 0
x = 0
x in { 0}
x belongs to the empty set
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