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D( X )
X-1 = 0
X-1 = 0
X-1 = 0
X-1 = 0 // + 1
X = 1
X in (-oo:1) U (1:+oo)
(8*X-5)/(X-1) = 10/6 // - 10/6
(8*X-5)/(X-1)-(10/6) = 0
(8*X-5)/(X-1)-5/3 = 0
(3*(8*X-5))/(3*(X-1))+(-5*(X-1))/(3*(X-1)) = 0
3*(8*X-5)-5*(X-1) = 0
19*X-10 = 0
(19*X-10)/(3*(X-1)) = 0
(19*X-10)/(3*(X-1)) = 0 // * 3*(X-1)
19*X-10 = 0
19*X-10 = 0 // + 10
19*X = 10 // : 19
X = 10/19
X = 10/19
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