(7/x-5)(3/7x)

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Solution for (7/x-5)(3/7x) equation: 


D( x )

x = 0

x = 0

x = 0

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

(3/7)*x*(7/x-5) = 0

3/7*x*(7*x^-1-5) = 0

( 3/7*x )

3/7*x = 0 // : 3/7

x = 0

( 7*x^-1-5 )

7*x^-1 = 5 // : 7

x^-1 = 5/7

-1 < 0

1/(x^1) = 5/7 // * x^1

1 = 5/7*x^1 // : 5/7

7/5 = x^1

x = 7/5

x in { 0} 

x = 7/5

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