7/8=21/X

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Solution for 7/8=21/X equation: 


D( X )

X = 0

X = 0

X = 0

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

7/8 = 21/X // - 21/X

7/8-(21/X) = 0

7/8-21*X^-1 = 0

-21*X^-1 = -7/8 // : -21

X^-1 = 1/24

-1 < 0

1/(X^1) = 1/24 // * X^1

1 = 1/24*X^1 // : 1/24

24 = X^1

X = 24

X = 24

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