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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x+1)/x = -3 // + 3
(2*x+1)/x+3 = 0
(2*x+1)/x+(3*x)/x = 0
2*x+3*x+1 = 0
5*x+1 = 0
(5*x+1)/x = 0
(5*x+1)/x = 0 // * x
5*x+1 = 0
5*x+1 = 0 // - 1
5*x = -1 // : 5
x = -1/5
x = -1/5
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