6/8=21/b

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Solution for 6/8=21/b equation: 


D( b )

b = 0

b = 0

b = 0

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

6/8 = 21/b // - 21/b

6/8-(21/b) = 0

6/8-21*b^-1 = 0

-21*b^-1 = -3/4 // : -21

b^-1 = 1/28

-1 < 0

1/(b^1) = 1/28 // * b^1

1 = 1/28*b^1 // : 1/28

28 = b^1

b = 28

b = 28

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