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D( x )
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x in (-oo:2/3) U (2/3:+oo)
y = (5*x+1)/(3*x-2) // - (5*x+1)/(3*x-2)
y-((5*x+1)/(3*x-2)) = 0
(-1*(5*x+1))/(3*x-2)+y = 0
(-1*(5*x+1))/(3*x-2)+(y*(3*x-2))/(3*x-2) = 0
y*(3*x-2)-1*(5*x+1) = 0
3*x*y-5*x-2*y-1 = 0
(3*x*y-5*x-2*y-1)/(3*x-2) = 0
(3*x*y-5*x-2*y-1)/(3*x-2) = 0 // * 3*x-2
3*x*y-5*x-2*y-1 = 0
3*x*y-2*y-1 = 0 // + -2*y-1
3*x*y = -(-2*y-1) // : 3*y
x = (-(-2*y-1))/(3*y)
x = (1-(-2*y))/(3*y)
x = (1-(-2*y))/(3*y)
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