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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)
-2*x-1 = -(10/(x+1)) // + 10/(x+1)
10/(x+1)-2*x-1 = 0
10/(x+1)+(-2*x*(x+1))/(x+1)+(-1*(x+1))/(x+1) = 0
10-2*x*(x+1)-1*(x+1) = 0
10-2*x^2-2*x-x-1 = 0
9-2*x^2-3*x = 0
9-2*x^2-3*x = 0
9-2*x^2-3*x = 0
DELTA = (-3)^2-(-2*4*9)
DELTA = 81
DELTA > 0
x = (81^(1/2)+3)/(-2*2) or x = (3-81^(1/2))/(-2*2)
x = -3 or x = 3/2
(x+3)*(x-3/2) = 0
((x+3)*(x-3/2))/(x+1) = 0
((x+3)*(x-3/2))/(x+1) = 0 // * x+1
(x+3)*(x-3/2) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-3/2 )
x-3/2 = 0 // + 3/2
x = 3/2
x in { -3, 3/2 }
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