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