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

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


D( x )

x-3 = 0

x-3 = 0

x-3 = 0

x-3 = 0 // + 3

x = 3

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

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

(7*x)/(x-3)-21*(x-3)^-1 = 0

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

7*x-21 = 0

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

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

7*x-21 = 0

7*x-21 = 0 // + 21

7*x = 21 // : 7

x = 21/7

x = 3

x in { 3} 

x belongs to the empty set

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