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D( x )
x-2 = 0
x-4 = 0
(x-4)*(x-2) = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
(x-4)*(x-2) = 0
(x-4)*(x-2) = 0
( x-2 )
x-2 = 0 // + 2
x = 2
( x-4 )
x-4 = 0 // + 4
x = 4
x in (-oo:2) U (2:4) U (4:+oo)
2/((x-4)*(x-2)) = 1/(x-4)+2/(x-2) // - 1/(x-4)+2/(x-2)
2/((x-4)*(x-2))-(1/(x-4))-(2/(x-2)) = 0
2/((x-4)*(x-2))-(x-4)^-1-2*(x-2)^-1 = 0
2/((x-4)*(x-2))-1/(x-4)-2/(x-2) = 0
2/((x-4)*(x-2))+(-1*(x-2))/((x-4)*(x-2))+(-2*(x-4))/((x-4)*(x-2)) = 0
2-1*(x-2)-2*(x-4) = 0
4-x-2*x+8 = 0
12-3*x = 0
(12-3*x)/((x-4)*(x-2)) = 0
(12-3*x)/((x-4)*(x-2)) = 0 // * (x-4)*(x-2)
12-3*x = 0
12-3*x = 0 // - 12
-3*x = -12 // : -3
x = -12/(-3)
x = 4
x in { 4}
x belongs to the empty set
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