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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
20/8.7 = 5.8/m // - 5.8/m
20/8.7-(5.8/m) = 0
20/8.7-5.8*m^-1 = 0
-5.8*m^-1 = -2.29885057 // : -5.8
m^-1 = 0.39635355
-1 < 0
1/(m^1) = 0.39635355 // * m^1
1 = 0.39635355*m^1 // : 0.39635355
2.52299998 = m^1
m = 2.52299998
m = 2.52299998
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