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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
y = (3*x-10)/(x-3) // - (3*x-10)/(x-3)
y-((3*x-10)/(x-3)) = 0
(-1*(3*x-10))/(x-3)+y = 0
(-1*(3*x-10))/(x-3)+(y*(x-3))/(x-3) = 0
y*(x-3)-1*(3*x-10) = 0
x*y-3*x-3*y+10 = 0
(x*y-3*x-3*y+10)/(x-3) = 0
(x*y-3*x-3*y+10)/(x-3) = 0 // * x-3
x*y-3*x-3*y+10 = 0
x*y-3*y+10 = 0 // - 10-3*y
x*y = -(10-3*y) // : y
x = (-(10-3*y))/y
x = -(y^-1*(10-3*y))
x = -(y^-1*(10-3*y))
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