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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+2)/(x-6) = 55 // - 55
(x+2)/(x-6)-55 = 0
(x+2)/(x-6)+(-55*(x-6))/(x-6) = 0
x-55*(x-6)+2 = 0
332-54*x = 0
(332-54*x)/(x-6) = 0
(332-54*x)/(x-6) = 0 // * x-6
332-54*x = 0
332-54*x = 0 // - 332
-54*x = -332 // : -54
x = -332/(-54)
x = 166/27
x = 166/27
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