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