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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
25/7 = 50/m // - 50/m
25/7-(50/m) = 0
25/7-50*m^-1 = 0
-50*m^-1 = -25/7 // : -50
m^-1 = 1/14
-1 < 0
1/(m^1) = 1/14 // * m^1
1 = 1/14*m^1 // : 1/14
14 = m^1
m = 14
m = 14
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