(7x+1)(x-3)/(7x-1)(3-x)

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Solution for (7x+1)(x-3)/(7x-1)(3-x) equation: 


D( x )

7*x-1 = 0

7*x-1 = 0

7*x-1 = 0

7*x-1 = 0 // + 1

7*x = 1 // : 7

x = 1/7

x in (-oo:1/7) U (1/7:+oo)

(((7*x+1)*(x-3))/(7*x-1))*(3-x) = 0

((7*x+1)*(x-3)*(3-x))/(7*x-1) = 0

( 3-x )

3-x = 0 // - 3

-x = -3 // * -1

x = 3

( 7*x+1 )

7*x+1 = 0 // - 1

7*x = -1 // : 7

x = -1/7

( x-3 )

x-3 = 0 // + 3

x = 3

x in { 3, -1/7, 3 }

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