30/105=28/x

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Solution for 30/105=28/x equation: 


D( x )

x = 0

x = 0

x = 0

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

30/105 = 28/x // - 28/x

30/105-(28/x) = 0

30/105-28*x^-1 = 0

-28*x^-1 = -2/7 // : -28

x^-1 = 1/98

-1 < 0

1/(x^1) = 1/98 // * x^1

1 = 1/98*x^1 // : 1/98

98 = x^1

x = 98

x = 98

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