7/5=4/x

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Solution for 7/5=4/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7/5 = 4/x // - 4/x

7/5-(4/x) = 0

7/5-4*x^-1 = 0

-4*x^-1 = -7/5 // : -4

x^-1 = 7/20

-1 < 0

1/(x^1) = 7/20 // * x^1

1 = 7/20*x^1 // : 7/20

20/7 = x^1

x = 20/7

x = 20/7

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