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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/(x-6) = 40 // - 40
x/(x-6)-40 = 0
x/(x-6)+(-40*(x-6))/(x-6) = 0
x-40*(x-6) = 0
240-39*x = 0
(240-39*x)/(x-6) = 0
(240-39*x)/(x-6) = 0 // * x-6
240-39*x = 0
240-39*x = 0 // - 240
-39*x = -240 // : -39
x = -240/(-39)
x = 80/13
x = 80/13
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