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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)
(16*x^2-25)/(4*x-5) = 0
16*x^2 = 25 // : 16
x^2 = 25/16
x^2 = 25/16 // ^ 1/2
abs(x) = 5/4
x = 5/4 or x = -5/4
x in { 5/4}
x = -5/4
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