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a in (-oo:+oo)
8-(7*a)-(2*a) = -46 // + 46
8-(7*a)-(2*a)+46 = 0
8-7*a-2*a+46 = 0
54-9*a = 0 // - 54
-9*a = -54 // : -9
a = -54/(-9)
a = 6
a = 6
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