(3x+15)/(x+5)

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Solution for (3x+15)/(x+5) equation: 


D( x )

x+5 = 0

x+5 = 0

x+5 = 0

x+5 = 0 // - 5

x = -5

x in (-oo:-5) U (-5:+oo)

(3*x+15)/(x+5) = 0

3*x+15 = 0 // - 15

3*x = -15 // : 3

x = -15/3

x = -5

x in { -5} 

x belongs to the empty set

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