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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
26/15 = 130/m // - 130/m
26/15-(130/m) = 0
26/15-130*m^-1 = 0
-130*m^-1 = -26/15 // : -130
m^-1 = 1/75
-1 < 0
1/(m^1) = 1/75 // * m^1
1 = 1/75*m^1 // : 1/75
75 = m^1
m = 75
m = 75
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