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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((7*x^-3)/8)*y^-5-3 = 0
7/8*x^-3*y^-5 = 3 // : 7/8*y^-5
x^-3 = 24/7*y^5
-3 < 0
1/(x^3) = 24/7*y^5 // * x^3
1 = 24/7*x^3*y^5 // : 24/7*y^5
7/24*y^-5 = x^3
x^3 = 7/24*y^-5 // ^ 1/3
x = (7/24)^(1/3)*y^(-5/3)
x = (7/24)^(1/3)*y^(-5/3)
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