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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(x-1)/(x-6)-(1/2) = (11-x)/(x-6) // - (11-x)/(x-6)
(x-1)/(x-6)-((11-x)/(x-6))-(1/2) = 0
(x-1)/(x-6)-((11-x)/(x-6))-1/2 = 0
(x-1)/(x-6)+(-1*(11-x))/(x-6)-1/2 = 0
(2*(x-1))/(2*(x-6))+(-1*2*(11-x))/(2*(x-6))+(-1*(x-6))/(2*(x-6)) = 0
2*(x-1)-1*2*(11-x)-1*(x-6) = 0
4*x-x-24+6 = 0
3*x-18 = 0
(3*x-18)/(2*(x-6)) = 0
(3*x-18)/(2*(x-6)) = 0 // * 2*(x-6)
3*x-18 = 0
3*x-18 = 0 // + 18
3*x = 18 // : 3
x = 18/3
x = 6
x in { 6}
x belongs to the empty set
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