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