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