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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
3.7/m = -8 // + 8
3.7/m+8 = 0
3.7*m^-1 = -8 // : 3.7
m^-1 = -2.16216216
-1 < 0
1/(m^1) = -2.16216216 // * m^1
1 = -2.16216216*m^1 // : -2.16216216
-0.4625 = m^1
m = -0.4625
m = -0.4625
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