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D( x )
x-6 = 0
x-8 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:6) U (6:8) U (8:+oo)
X/(x-6) = 3/(x-8) // - 3/(x-8)
X/(x-6)-(3/(x-8)) = 0
X/(x-6)-3*(x-8)^-1 = 0
X/(x-6)-3/(x-8) = 0
(X*(x-8))/((x-6)*(x-8))+(-3*(x-6))/((x-6)*(x-8)) = 0
X*(x-8)-3*(x-6) = 0
X*x-8*X-3*x+18 = 0
(X*x-8*X-3*x+18)/((x-6)*(x-8)) = 0
(X*x-8*X-3*x+18)/((x-6)*(x-8)) = 0 // * (x-6)*(x-8)
X*x-8*X-3*x+18 = 0
18-8*X-3*x = 0 // - 18-8*X
-3*x = -(18-8*X) // : -3
x = (-(18-8*X))/(-3)
x = (18-8*X)/3
x = (18-8*X)/3
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