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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x-40)/x = 1 // - 1
(8*x-40)/x-1 = 0
(8*x-40)/x+(-1*x)/x = 0
8*x-1*x-40 = 0
7*x-40 = 0
(7*x-40)/x = 0
(7*x-40)/x = 0 // * x
7*x-40 = 0
7*x-40 = 0 // + 40
7*x = 40 // : 7
x = 40/7
x = 40/7
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