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D( x )
35*x = 0
x-1 = 0
35*x = 0
35*x = 0
35*x = 0 // : 35
x = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
(((2*x-2)/77)/(x-1))/(35*x) = 0
(2*x-2)/(35*77*x*(x-1)) = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x in { 1}
x belongs to the empty set
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