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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-(5/7))/x = 1/7 // - 1/7
(x-(5/7))/x-(1/7) = 0
(x-5/7)/x-1/7 = 0
(7*(x-5/7))/(7*x)+(-1*x)/(7*x) = 0
7*(x-5/7)-1*x = 0
6*x-5 = 0
(6*x-5)/(7*x) = 0
(6*x-5)/(7*x) = 0 // * 7*x
6*x-5 = 0
6*x-5 = 0 // + 5
6*x = 5 // : 6
x = 5/6
x = 5/6
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