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D( x )
3*x-6 = 0
3*x-6 = 0
3*x-6 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x in (-oo:2) U (2:+oo)
y = 1/(3*x-6) // - 1/(3*x-6)
y-(1/(3*x-6)) = 0
y-(3*x-6)^-1 = 0
y-1/(3*x-6) = 0
(y*(3*x-6))/(3*x-6)-1/(3*x-6) = 0
y*(3*x-6)-1 = 0
3*x*y-6*y-1 = 0
(3*x*y-6*y-1)/(3*x-6) = 0
(3*x*y-6*y-1)/(3*x-6) = 0 // * 3*x-6
3*x*y-6*y-1 = 0
3*x*y-6*y-1 = 0 // + -6*y-1
3*x*y = -(-6*y-1) // : 3*y
x = (-(-6*y-1))/(3*y)
x = (1-(-6*y))/(3*y)
x = (1-(-6*y))/(3*y)
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