28/5=140/x

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Solution for 28/5=140/x equation: 


D( x )

x = 0

x = 0

x = 0

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

28/5 = 140/x // - 140/x

28/5-(140/x) = 0

28/5-140*x^-1 = 0

-140*x^-1 = -28/5 // : -140

x^-1 = 1/25

-1 < 0

1/(x^1) = 1/25 // * x^1

1 = 1/25*x^1 // : 1/25

25 = x^1

x = 25

x = 25

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