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m in (-oo:+oo)
(1/4)*(8*m-12) = 0
1/4*(8*m-12) = 0
( 1/4 )
1/4 = 0
m belongs to the empty set
( 8*m-12 )
8*m-12 = 0 // + 12
8*m = 12 // : 8
m = 12/8
m = 3/2
m = 3/2
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