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D( x )
32*x^25*y^-15 = 0
32*x^25*y^-15 = 0
32*x^25*y^-15 = 0
32*x^25*y^-15 = 0 // : 32*y^-15
x^25 = 0
x = 0
x in (-oo:0) U (0:+oo)
((32*x^25*y^-15)^-3)/5 = 0
1/163840*x^-75*y^45 = 0 // : 1/163840*y^45
x^-75 = 0
x należy do O
x belongs to the empty set
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