(5a-15)/(3-a)

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Solution for (5a-15)/(3-a) equation: 


D( a )

3-a = 0

3-a = 0

3-a = 0

3-a = 0 // - 3

-a = -3 // * -1

a = 3

a in (-oo:3) U (3:+oo)

(5*a-15)/(3-a) = 0

5*a-15 = 0 // + 15

5*a = 15 // : 5

a = 15/5

a = 3

a in { 3} 

a belongs to the empty set

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