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