20/(20+5x)

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Solution for 20/(20+5x) equation: 


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)

20/(5*x+20) = 0

x belongs to the empty set

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