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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)
(4-3*x)/(2*x+1) = 0
4-3*x = 0 // - 4
-3*x = -4 // : -3
x = -4/(-3)
x = 4/3
x = 4/3
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