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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
4/m+6 = 70 // - 70
4/m-70+6 = 0
4*m^-1 = 64 // : 4
m^-1 = 16
-1 < 0
1/(m^1) = 16 // * m^1
1 = 16*m^1 // : 16
1/16 = m^1
m = 1/16
m = 1/16
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