90/b=9

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Solution for 90/b=9 equation: 


D( b )

b = 0

b = 0

b = 0

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

90/b = 9 // - 9

90/b-9 = 0

90*b^-1 = 9 // : 90

b^-1 = 1/10

-1 < 0

1/(b^1) = 1/10 // * b^1

1 = 1/10*b^1 // : 1/10

10 = b^1

b = 10

b = 10

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