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a in (-oo:+oo)
8-a-(5*a) = 14 // - 14
8-a-(5*a)-14 = 0
8-a-5*a-14 = 0
-6*a-6 = 0 // + 6
-6*a = 6 // : -6
a = 6/(-6)
a = -1
a = -1
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