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D( x )
2*x+1.41 = 0
2*x+1.41 = 0
2*x+1.41 = 0
2*x+1.41 = 0 // - 1.41
2*x = -1.41 // : 2
x = -1.41/2
x = -0.705
x in (-oo:-0.705) U (-0.705:+oo)
(2*x+0.59)/(2*x+1.41) = 0
2*x+0.59 = 0 // - 0.59
2*x = -0.59 // : 2
x = -0.59/2
x = -0.295
x = -0.295
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