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