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D( x )
4*x+5 = 0
4*x+5 = 0
4*x+5 = 0
4*x+5 = 0 // - 5
4*x = -5 // : 4
x = -5/4
x in (-oo:-5/4) U (-5/4:+oo)
(7*x-1)/(4*x+5) = 0
7*x-1 = 0 // + 1
7*x = 1 // : 7
x = 1/7
x = 1/7
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