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D( x )
5*x+3 = 0
5*x+3 = 0
5*x+3 = 0
5*x+3 = 0 // - 3
5*x = -3 // : 5
x = -3/5
x in (-oo:-3/5) U (-3/5:+oo)
3000/(5*x+3) = 0
x belongs to the empty set
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