12/40=3/b

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Solution for 12/40=3/b equation: 


D( b )

b = 0

b = 0

b = 0

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

12/40 = 3/b // - 3/b

12/40-(3/b) = 0

12/40-3*b^-1 = 0

-3*b^-1 = -3/10 // : -3

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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