(9y-27)/(y-3)

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Solution for (9y-27)/(y-3) equation: 


D( y )

y-3 = 0

y-3 = 0

y-3 = 0

y-3 = 0 // + 3

y = 3

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

(9*y-27)/(y-3) = 0

9*y-27 = 0 // + 27

9*y = 27 // : 9

y = 27/9

y = 3

y in { 3} 

y belongs to the empty set

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