4/20=18/m

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Solution for 4/20=18/m equation: 


D( m )

m = 0

m = 0

m = 0

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

4/20 = 18/m // - 18/m

4/20-(18/m) = 0

4/20-18*m^-1 = 0

-18*m^-1 = -1/5 // : -18

m^-1 = 1/90

-1 < 0

1/(m^1) = 1/90 // * m^1

1 = 1/90*m^1 // : 1/90

90 = m^1

m = 90

m = 90

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