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D( m )
m-10 = 0
m-10 = 0
m-10 = 0
m-10 = 0 // + 10
m = 10
m in (-oo:10) U (10:+oo)
3/(m-10) = 12 // - 12
3/(m-10)-12 = 0
3/(m-10)+(-12*(m-10))/(m-10) = 0
3-12*(m-10) = 0
123-12*m = 0
(123-12*m)/(m-10) = 0
(123-12*m)/(m-10) = 0 // * m-10
123-12*m = 0
123-12*m = 0 // - 123
-12*m = -123 // : -12
m = -123/(-12)
m = 41/4
m = 41/4
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