2/5=28/x

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Solution for 2/5=28/x equation: 


D( x )

x = 0

x = 0

x = 0

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

2/5 = 28/x // - 28/x

2/5-(28/x) = 0

2/5-28*x^-1 = 0

-28*x^-1 = -2/5 // : -28

x^-1 = 1/70

-1 < 0

1/(x^1) = 1/70 // * x^1

1 = 1/70*x^1 // : 1/70

70 = x^1

x = 70

x = 70

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