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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/6)/(5/12) = (3/5)/x // - (3/5)/x
(1/6)/(5/12)-((3/5)/x) = 0
(-3/5)*x^-1+(1/6)/(5/12) = 0
-3/5*x^-1 = -2/5 // : -3/5
x^-1 = 2/3
-1 < 0
1/(x^1) = 2/3 // * x^1
1 = 2/3*x^1 // : 2/3
3/2 = x^1
x = 3/2
x = 3/2
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