7/b=21

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Solution for 7/b=21 equation: 


D( b )

b = 0

b = 0

b = 0

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

7/b = 21 // - 21

7/b-21 = 0

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

b^-1 = 3

-1 < 0

1/(b^1) = 3 // * b^1

1 = 3*b^1 // : 3

1/3 = b^1

b = 1/3

b = 1/3

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