(9/x-1)*(7/x-3)

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Solution for (9/x-1)*(7/x-3) equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

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

(9*x^-1-1)*(7*x^-1-3) = 0

( 7*x^-1-3 )

7*x^-1 = 3 // : 7

x^-1 = 3/7

-1 < 0

1/(x^1) = 3/7 // * x^1

1 = 3/7*x^1 // : 3/7

7/3 = x^1

x = 7/3

( 9*x^-1-1 )

9*x^-1 = 1 // : 9

x^-1 = 1/9

-1 < 0

1/(x^1) = 1/9 // * x^1

1 = 1/9*x^1 // : 1/9

9 = x^1

x = 9

x in { 7/3, 9 }

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