8/20=120/b

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Solution for 8/20=120/b equation: 


D( b )

b = 0

b = 0

b = 0

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

8/20 = 120/b // - 120/b

8/20-(120/b) = 0

8/20-120*b^-1 = 0

-120*b^-1 = -2/5 // : -120

b^-1 = 1/300

-1 < 0

1/(b^1) = 1/300 // * b^1

1 = 1/300*b^1 // : 1/300

300 = b^1

b = 300

b = 300

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