(7x-21)/(x-1)

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Solution for (7x-21)/(x-1) equation: 


D( x )

x-1 = 0

x-1 = 0

x-1 = 0

x-1 = 0 // + 1

x = 1

x in (-oo:1) U (1:+oo)

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

7*x-21 = 0 // + 21

7*x = 21 // : 7

x = 21/7

x = 3

x = 3

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