2/20=7/m

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Solution for 2/20=7/m equation: 


D( m )

m = 0

m = 0

m = 0

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

2/20 = 7/m // - 7/m

2/20-(7/m) = 0

2/20-7*m^-1 = 0

-7*m^-1 = -1/10 // : -7

m^-1 = 1/70

-1 < 0

1/(m^1) = 1/70 // * m^1

1 = 1/70*m^1 // : 1/70

70 = m^1

m = 70

m = 70

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