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a in (-oo:+oo)
a-(6*a)-1 = 9 // - 9
a-(6*a)-9-1 = 0
a-6*a-9-1 = 0
-5*a-10 = 0 // + 10
-5*a = 10 // : -5
a = 10/(-5)
a = -2
a = -2
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