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