21/9=27/B

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Solution for 21/9=27/B equation: 


D( B )

B = 0

B = 0

B = 0

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

21/9 = 27/B // - 27/B

21/9-(27/B) = 0

21/9-27*B^-1 = 0

-27*B^-1 = -7/3 // : -27

B^-1 = 7/81

-1 < 0

1/(B^1) = 7/81 // * B^1

1 = 7/81*B^1 // : 7/81

81/7 = B^1

B = 81/7

B = 81/7

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