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a in (-oo:+oo)
9-(2*a) = 6*a-47 // - 6*a-47
9-(2*a)-(6*a)+47 = 0
9-2*a-6*a+47 = 0
56-8*a = 0 // - 56
-8*a = -56 // : -8
a = -56/(-8)
a = 7
a = 7
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