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a in (-oo:+oo)
8-6*a = 2*a-56 // - 2*a-56
8-6*a-(2*a)+56 = 0
8-6*a-2*a+56 = 0
64-8*a = 0 // - 64
-8*a = -64 // : -8
a = -64/(-8)
a = 8
a = 8
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