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D( x )
x-(1/77) = 0
x-(1/77) = 0
x-(1/77) = 0
x-1/77 = 0
x-1/77 = 0 // + 1/77
x = 1/77
x in (-oo:1/77) U (1/77:+oo)
(2*x-(2/35))/(x-(1/77)) = 0
(2*x-2/35)/(x-1/77) = 0
2*x-2/35 = 0 // + 2/35
2*x = 2/35 // : 2
x = 2/35/2
x = 1/35
x = 1/35
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