21/b=3

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Solution for 21/b=3 equation: 


D( b )

b = 0

b = 0

b = 0

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

21/b = 3 // - 3

21/b-3 = 0

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

b^-1 = 1/7

-1 < 0

1/(b^1) = 1/7 // * b^1

1 = 1/7*b^1 // : 1/7

7 = b^1

b = 7

b = 7

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