4=7/x

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Solution for 4=7/x equation: 


D( x )

x = 0

x = 0

x = 0

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

4 = 7/x // - 7/x

4-(7/x) = 0

4-7*x^-1 = 0

-7*x^-1 = -4 // : -7

x^-1 = 4/7

-1 < 0

1/(x^1) = 4/7 // * x^1

1 = 4/7*x^1 // : 4/7

7/4 = x^1

x = 7/4

x = 7/4

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