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D( m )
16-m = 0
16-m = 0
16-m = 0
16-m = 0 // - 16
-m = -16 // * -1
m = 16
m in (-oo:16) U (16:+oo)
(m^2-(16*m))/(16-m) = 0
(m^2-16*m)/(16-m) = 0
m^2-16*m = 0
m*(m-16) = 0
m-16 = 0 // + 16
m = 16
m*(m-16) = 0
(m*(m-16))/(16-m) = 0
( m-16 )
m-16 = 0 // + 16
m = 16
( m )
m = 0
m in { 16}
m = 0
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