(5x+20)/(x-4)

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Solution for (5x+20)/(x-4) equation: 


D( x )

x-4 = 0

x-4 = 0

x-4 = 0

x-4 = 0 // + 4

x = 4

x in (-oo:4) U (4:+oo)

(5*x+20)/(x-4) = 0

5*x+20 = 0 // - 20

5*x = -20 // : 5

x = -20/5

x = -4

x = -4

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