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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)
3/(2*X+1) = X+1 // - X+1
3/(2*X+1)-X-1 = 0
3/(2*X+1)+(-X*(2*X+1))/(2*X+1)+(-1*(2*X+1))/(2*X+1) = 0
3-X*(2*X+1)-1*(2*X+1) = 0
3-2*X^2-X-2*X-1 = 0
2-2*X^2-3*X = 0
2-2*X^2-3*X = 0
2-2*X^2-3*X = 0
DELTA = (-3)^2-(-2*2*4)
DELTA = 25
DELTA > 0
X = (25^(1/2)+3)/(-2*2) or X = (3-25^(1/2))/(-2*2)
X = -2 or X = 1/2
(X+2)*(X-1/2) = 0
((X+2)*(X-1/2))/(2*X+1) = 0
((X+2)*(X-1/2))/(2*X+1) = 0 // * 2*X+1
(X+2)*(X-1/2) = 0
( X+2 )
X+2 = 0 // - 2
X = -2
( X-1/2 )
X-1/2 = 0 // + 1/2
X = 1/2
X in { -2, 1/2 }
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