20/28=5/x

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Solution for 20/28=5/x equation: 


D( x )

x = 0

x = 0

x = 0

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

20/28 = 5/x // - 5/x

20/28-(5/x) = 0

20/28-5*x^-1 = 0

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

x^-1 = 1/7

-1 < 0

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

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

7 = x^1

x = 7

x = 7

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