(3x-21)/(x-7)

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Solution for (3x-21)/(x-7) equation: 


D( x )

x-7 = 0

x-7 = 0

x-7 = 0

x-7 = 0 // + 7

x = 7

x in (-oo:7) U (7:+oo)

(3*x-21)/(x-7) = 0

3*x-21 = 0 // + 21

3*x = 21 // : 3

x = 21/3

x = 7

x in { 7} 

x belongs to the empty set

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