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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
5*x-4 = 8/(x-2) // - 8/(x-2)
5*x-(8/(x-2))-4 = 0
5*x-8*(x-2)^-1-4 = 0
5*x-8/(x-2)-4 = 0
(5*x*(x-2))/(x-2)-8/(x-2)+(-4*(x-2))/(x-2) = 0
5*x*(x-2)-4*(x-2)-8 = 0
5*x^2-10*x-4*x-8+8 = 0
5*x^2-14*x = 0
5*x^2-14*x = 0
x*(5*x-14) = 0
5*x-14 = 0 // + 14
5*x = 14 // : 5
x = 14/5
x*(x-14/5) = 0
(x*(x-14/5))/(x-2) = 0
(x*(x-14/5))/(x-2) = 0 // * x-2
x*(x-14/5) = 0
( x-14/5 )
x-14/5 = 0 // + 14/5
x = 14/5
( x )
x = 0
x in { 14/5, 0 }
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