13/(5x-20)

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Solution for 13/(5x-20) 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)

13/(5*x-20) = 0

x belongs to the empty set

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