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D( x )
4*x+1 = 0
4*x+1 = 0
4*x+1 = 0
4*x+1 = 0 // - 1
4*x = -1 // : 4
x = -1/4
x in (-oo:-1/4) U (-1/4:+oo)
(5*x-2)/(4*x+1) = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
x = 2/5
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