7/x=12/21

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Solution for 7/x=12/21 equation: 


D( x )

x = 0

x = 0

x = 0

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

7/x = 12/21 // - 12/21

7/x-(12/21) = 0

7/x-4/7 = 0

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

x^-1 = 4/49

-1 < 0

1/(x^1) = 4/49 // * x^1

1 = 4/49*x^1 // : 4/49

49/4 = x^1

x = 49/4

x = 49/4

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