0.9=9/b

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Solution for 0.9=9/b equation: 


D( b )

b = 0

b = 0

b = 0

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

0.9 = 9/b // - 9/b

0.9-(9/b) = 0

0.9-9*b^-1 = 0

-9*b^-1 = -0.9 // : -9

b^-1 = 0.1

-1 < 0

1/(b^1) = 0.1 // * b^1

1 = 0.1*b^1 // : 0.1

10 = b^1

b = 10

b = 10

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