(3x-9)/(x+5)

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Solution for (3x-9)/(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-9)/(x+5) = 0

3*x-9 = 0 // + 9

3*x = 9 // : 3

x = 9/3

x = 3

x = 3

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