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D( x )
x-6 = 0
x-11 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x-11 = 0
x-11 = 0
x-11 = 0 // + 11
x = 11
x in (-oo:6) U (6:11) U (11:+oo)
11/(x-6) = 6/(x-11) // - 6/(x-11)
11/(x-6)-(6/(x-11)) = 0
11/(x-6)-6*(x-11)^-1 = 0
11/(x-6)-6/(x-11) = 0
(11*(x-11))/((x-6)*(x-11))+(-6*(x-6))/((x-6)*(x-11)) = 0
11*(x-11)-6*(x-6) = 0
5*x-85 = 0
(5*x-85)/((x-6)*(x-11)) = 0
(5*x-85)/((x-6)*(x-11)) = 0 // * (x-6)*(x-11)
5*x-85 = 0
5*x-85 = 0 // + 85
5*x = 85 // : 5
x = 85/5
x = 17
x = 17
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