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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)
a = 1/(x+1) // - 1/(x+1)
a-(1/(x+1)) = 0
a-(x+1)^-1 = 0
a-1/(x+1) = 0
(a*(x+1))/(x+1)-1/(x+1) = 0
a*(x+1)-1 = 0
a*x+a-1 = 0
(a*x+a-1)/(x+1) = 0
(a*x+a-1)/(x+1) = 0 // * x+1
a*x+a-1 = 0
a*x+a-1 = 0 // - a-1
a*x = -(a-1) // : a
x = (-(a-1))/a
x = (1-a)/a
x = (1-a)/a
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