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D( m )
16*m = 0
16*m = 0
16*m = 0
16*m = 0 // : 16
m = 0
m in (-oo:0) U (0:+oo)
0.8 = 15/(16*m) // - 15/(16*m)
0.8-(15/(16*m)) = 0
(-15/16)*m^-1+0.8 = 0
-15/16*m^-1 = -0.8 // : -15/16
m^-1 = 0.85333333
-1 < 0
1/(m^1) = 0.85333333 // * m^1
1 = 0.85333333*m^1 // : 0.85333333
1.171875 = m^1
m = 1.171875
m = 1.171875
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