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