(x-9)(4/x-7)

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Solution for (x-9)(4/x-7) equation: 


D( x )

x = 0

x = 0

x = 0

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

(x-9)*(4/x-7) = 0

(x-9)*(4*x^-1-7) = 0

( 4*x^-1-7 )

4*x^-1 = 7 // : 4

x^-1 = 7/4

-1 < 0

1/(x^1) = 7/4 // * x^1

1 = 7/4*x^1 // : 7/4

4/7 = x^1

x = 4/7

( x-9 )

x-9 = 0 // + 9

x = 9

x in { 4/7, 9 }

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