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D( x )
x^2*y = 0
x^2*y = 0
x^2*y = 0
x^2*y = 0 // : y
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
0.15*y = 8000/(x^2*y) // - 8000/(x^2*y)
0.15*y-(8000/(x^2*y)) = 0
0.15*y-8000*x^-2*y^-1 = 0
-8000*x^-2*y^-1 = -(0.15*y) // : -8000*y^-1
x^-2 = 0.00001875*y^2
-2 < 0
1/(x^2) = 0.00001875*y^2 // * x^2
1 = 0.00001875*x^2*y^2 // : 0.00001875*y^2
53333.33333333*y^-2 = x^2
x^2 = 53333.33333333*y^-2 // ^ 1/2
abs(x) = 53333.33333333^(1/2)*y^-1
x = 53333.33333333^(1/2)*y^-1 or x = -(53333.33333333^(1/2)*y^-1)
x in { 53333.33333333^(1/2)*y^-1, -(53333.33333333^(1/2)*y^-1) }
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