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D( x )
x-6 = 0
x-4 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:6) U (6:+oo)
1/(x-4) > 1/(x-6) // - 1/(x-6)
1/(x-4)-(1/(x-6)) > 0
1/(x-4)-(x-6)^-1 > 0
1/(x-4)-1/(x-6) > 0
(1*(x-6))/((x-4)*(x-6))+(-1*(x-4))/((x-4)*(x-6)) > 0
1*(x-6)-1*(x-4) > 0
-2 > 0
-2/((x-4)*(x-6)) > 0
-2/((x-4)*(x-6)) > 0 // * ((x-4)*(x-6))^2
-2*(x-4)*(x-6) > 0
( -2 )
-2 > 0
x belongs to the empty set
( x-4 )
x-4 > 0 // + 4
x > 4
( x-6 )
x-6 > 0 // + 6
x > 6
(-oo:4) (4:6) (6:+oo) -2 - - - x-4 - + + x-6 - - +
x in (4:6)
(4:6)
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