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