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