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A in (-oo:+oo)
2*(48-((4*A)/2)) = 0
2*(48-2*A) = 0
( 2 )
2 = 0
A belongs to the empty set
( 48-2*A )
48-2*A = 0 // - 48
-2*A = -48 // : -2
A = -48/(-2)
A = 24
A = 24
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