7/8=21/b

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Solution for 7/8=21/b equation: 


D( b )

b = 0

b = 0

b = 0

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

7/8 = 21/b // - 21/b

7/8-(21/b) = 0

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

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

b^-1 = 1/24

-1 < 0

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

1 = 1/24*b^1 // : 1/24

24 = b^1

b = 24

b = 24

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