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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(5*x-2)/(x-4) = -3 // + 3
(5*x-2)/(x-4)+3 = 0
(5*x-2)/(x-4)+(3*(x-4))/(x-4) = 0
3*(x-4)+5*x-2 = 0
8*x-14 = 0
(8*x-14)/(x-4) = 0
(8*x-14)/(x-4) = 0 // * x-4
8*x-14 = 0
8*x-14 = 0 // + 14
8*x = 14 // : 8
x = 14/8
x = 7/4
x = 7/4
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