28/m=80

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Solution for 28/m=80 equation: 


D( m )

m = 0

m = 0

m = 0

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

28/m = 80 // - 80

28/m-80 = 0

28*m^-1 = 80 // : 28

m^-1 = 20/7

-1 < 0

1/(m^1) = 20/7 // * m^1

1 = 20/7*m^1 // : 20/7

7/20 = m^1

m = 7/20

m = 7/20

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