7/8=4/b

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Solution for 7/8=4/b equation: 


D( b )

b = 0

b = 0

b = 0

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

7/8 = 4/b // - 4/b

7/8-(4/b) = 0

7/8-4*b^-1 = 0

-4*b^-1 = -7/8 // : -4

b^-1 = 7/32

-1 < 0

1/(b^1) = 7/32 // * b^1

1 = 7/32*b^1 // : 7/32

32/7 = b^1

b = 32/7

b = 32/7

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