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a in (-oo:+oo)
(4*a)/(-8) = 24 // - 24
(4*a)/(-8)-24 = 0
-1/2*a-24 = 0 // + 24
-1/2*a = 24 // : -1/2
a = 24/(-1/2)
a = -48
a = -48
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