80=700/x

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Solution for 80=700/x equation: 


D( x )

x = 0

x = 0

x = 0

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

80 = 700/x // - 700/x

80-(700/x) = 0

80-700*x^-1 = 0

-700*x^-1 = -80 // : -700

x^-1 = 4/35

-1 < 0

1/(x^1) = 4/35 // * x^1

1 = 4/35*x^1 // : 4/35

35/4 = x^1

x = 35/4

x = 35/4

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