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m in (-oo:+oo)
5*((1/2)*m-4) = 0
5*(1/2*m-4) = 0
( 1/2*m-4 )
1/2*m-4 = 0 // + 4
1/2*m = 4 // : 1/2
m = 4/1/2
m = 8
( 5 )
5 = 0
m belongs to the empty set
m = 8
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