3/7=21/X

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Solution for 3/7=21/X equation: 


D( X )

X = 0

X = 0

X = 0

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

3/7 = 21/X // - 21/X

3/7-(21/X) = 0

3/7-21*X^-1 = 0

-21*X^-1 = -3/7 // : -21

X^-1 = 1/49

-1 < 0

1/(X^1) = 1/49 // * X^1

1 = 1/49*X^1 // : 1/49

49 = X^1

X = 49

X = 49

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