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