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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^-3)/2)*y*((((x^7)/4)*y^-8)/7) = 0
1/56*x^4*y^-7 = 0 // : 1/56*y^-7
x^4 = 0
x = 0
x in { 0}
x belongs to the empty set
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