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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)
y-22 = (-4/3)/(x-6) // - (-4/3)/(x-6)
y-((-4/3)/(x-6))-22 = 0
(4/3)*(x-6)^-1+y-22 = 0
4/3/(x-6)+y-22 = 0
4/3/(x-6)+(y*(x-6))/(x-6)+(-22*(x-6))/(x-6) = 0
y*(x-6)-22*(x-6)+4/3 = 0
x*y-22*x-6*y+4/3+132 = 0
x*y-22*x-6*y+400/3 = 0
(x*y-22*x-6*y+400/3)/(x-6) = 0
(x*y-22*x-6*y+400/3)/(x-6) = 0 // * x-6
x*y-22*x-6*y+400/3 = 0
400/3-22*x-6*y = 0 // - 400/3-6*y
-22*x = -(400/3-6*y) // : -22
x = (-(400/3-6*y))/(-22)
x = (400/3-6*y)/22
x = (400/3-6*y)/22
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