70/30=5/x

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Solution for 70/30=5/x equation: 


D( x )

x = 0

x = 0

x = 0

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

70/30 = 5/x // - 5/x

70/30-(5/x) = 0

70/30-5*x^-1 = 0

-5*x^-1 = -7/3 // : -5

x^-1 = 7/15

-1 < 0

1/(x^1) = 7/15 // * x^1

1 = 7/15*x^1 // : 7/15

15/7 = x^1

x = 15/7

x = 15/7

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