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