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D( m )
3*m+9/6 = 0
3*m+9/6 = 0
3*m+9/6 = 0
3*m+3/2 = 0 // - 3/2
3*m = -3/2 // : 3
m = -3/2/3
m = -1/2
m in (-oo:-1/2) U (-1/2:+oo)
(2*m+6/3)/(3*m+9/6) = 0
(2*m+2)/(3*m+3/2) = 0
2*m+2 = 0 // - 2
2*m = -2 // : 2
m = -2/2
m = -1
m = -1
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