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D( x )
-6*x^2*y = 0
-6*x^2*y = 0
-6*x^2*y = 0
-6*x^2*y = 0 // : -6*y
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(12*x^2*y^2-30*x^3*y-(18*x^2*y))/(-6*x^2*y) = 0
(12*x^2*y^2-30*x^3*y-18*x^2*y)/(-6*x^2*y) = 0
12*x^2*y^2-30*x^3*y-18*x^2*y = 0
6*x^2*y*(2*y-5*x-3) = 0
2*y-5*x-3 = 0 // - 2*y-3
-5*x = -(2*y-3) // : -5
x = (-(2*y-3))/(-5)
x = (3-(2*y))/(-5)
6*x^2*y = 0
6*x^2*y = 0 // : 6*y
x^2 = 0
x = 0
x in { 0}
x = (3-(2*y))/(-5)
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