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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*x-2)/(2*x+1) = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x = 2/3
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