4/x=21/7

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Solution for 4/x=21/7 equation: 


D( x )

x = 0

x = 0

x = 0

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

4/x = 21/7 // - 21/7

4/x-(21/7) = 0

4/x-3 = 0

4*x^-1 = 3 // : 4

x^-1 = 3/4

-1 < 0

1/(x^1) = 3/4 // * x^1

1 = 3/4*x^1 // : 3/4

4/3 = x^1

x = 4/3

x = 4/3

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