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D( x )
5*x-20 = 0
5*x-20 = 0
5*x-20 = 0
5*x-20 = 0 // + 20
5*x = 20 // : 5
x = 20/5
x = 4
x in (-oo:4) U (4:+oo)
(4*x)/(5*x-20) = 0
4*x = 0 // : 4
x = 0
x = 0
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