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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1*(1/2))/x = 71/80 // - 71/80
(1*(1/2))/x-(71/80) = 0
(1/2)/x-71/80 = 0
1/2*x^-1 = 71/80 // : 1/2
x^-1 = 71/40
-1 < 0
1/(x^1) = 71/40 // * x^1
1 = 71/40*x^1 // : 71/40
40/71 = x^1
x = 40/71
x = 40/71
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