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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
40/8 = e/m // - e/m
40/8-(e/m) = 0
-e*m^-1 = -5 // : -e
m^-1 = 5/e
-1 < 0
1/(m^1) = 5/e // * m^1
1 = (5/e)*m^1 // : 5/e
1/(5/e) = m^1
m = 1/(5/e)
m = 1/(5/e)
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