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D( x )
3*x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:0) U (0:+oo)
(6*x-(2*y))/(3*x)-((9*x-(6*y))/(3*x)) = 0
(6*x-2*y)/(3*x)-((9*x-6*y)/(3*x)) = 0
(6*x-2*y)/(3*x)+(-1*(9*x-6*y))/(3*x) = 0
6*x-1*(9*x-6*y)-2*y = 0
4*y-3*x = 0
(4*y-3*x)/(3*x) = 0
(4*y-3*x)/(3*x) = 0 // * 3*x
4*y-3*x = 0
4*y-3*x = 0 // - 4*y
-3*x = -(4*y) // : -3
x = (-(4*y))/(-3)
x = (-4*y)/(-3)
x = (-4*y)/(-3)
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