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D( x )
x = 0
x^2*((6*x^-3*y^5)/36)*y^-7 = 0
x = 0
x = 0
x^2*((6*x^-3*y^5)/36)*y^-7 = 0
x^2*((6*x^-3*y^5)/36)*y^-7 = 0
1/6*x^-1*y^-2 = 0 // : 1/6*y^-2
x^-1 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(x^2*((6*x^-3*y^5)/36)*y^-7)^-2 = 0
36*x^2*y^4 = 0 // : 36*y^4
x^2 = 0
x = 0
x in { 0}
x belongs to the empty set
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