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a in (-oo:+oo)
2*(4-(4*a)) = -48 // + 48
2*(4-(4*a))+48 = 0
2*(4-4*a)+48 = 0
2*(4-4*a)+48 = 0
56-8*a = 0
56-8*a = 0
56-8*a = 0 // - 56
-8*a = -56 // : -8
a = -56/(-8)
a = 7
a = 7
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