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D( m )
m = 0
m = 0
m = 0
m in (-oo:0) U (0:+oo)
-8 = 7/m+2 // - 7/m+2
-(7/m)-8-2 = 0
-7*m^-1-8-2 = 0
-7*m^-1 = 10 // : -7
m^-1 = -10/7
-1 < 0
1/(m^1) = -10/7 // * m^1
1 = -10/7*m^1 // : -10/7
-7/10 = m^1
m = -7/10
m = -7/10
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