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