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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/8 = -4/x // + -4/x
3/8-(-4/x) = 0
4*x^-1+3/8 = 0
4*x^-1 = -3/8 // : 4
x^-1 = -3/32
-1 < 0
1/(x^1) = -3/32 // * x^1
1 = -3/32*x^1 // : -3/32
-32/3 = x^1
x = -32/3
x = -32/3
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