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D( x )
5*x-2 = 0
5*x-2 = 0
5*x-2 = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
x in (-oo:2/5) U (2/5:+oo)
7-(5/(5*x-2)) = 0
7-5*(5*x-2)^-1 = 0
7-5/(5*x-2) = 0
(7*(5*x-2))/(5*x-2)-5/(5*x-2) = 0
7*(5*x-2)-5 = 0
35*x-19 = 0
(35*x-19)/(5*x-2) = 0
(35*x-19)/(5*x-2) = 0 // * 5*x-2
35*x-19 = 0
35*x-19 = 0 // + 19
35*x = 19 // : 35
x = 19/35
x = 19/35
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