7=30/x

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Solution for 7=30/x equation: 


D( x )

x = 0

x = 0

x = 0

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

7 = 30/x // - 30/x

7-(30/x) = 0

7-30*x^-1 = 0

-30*x^-1 = -7 // : -30

x^-1 = 7/30

-1 < 0

1/(x^1) = 7/30 // * x^1

1 = 7/30*x^1 // : 7/30

30/7 = x^1

x = 30/7

x = 30/7

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