(4m-12)/(m-3)

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Solution for (4m-12)/(m-3) equation: 


D( m )

m-3 = 0

m-3 = 0

m-3 = 0

m-3 = 0 // + 3

m = 3

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

(4*m-12)/(m-3) = 0

4*m-12 = 0 // + 12

4*m = 12 // : 4

m = 12/4

m = 3

m in { 3} 

m belongs to the empty set

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