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a in (-oo:+oo)
a-(6*a)-2 = 38 // - 38
a-(6*a)-38-2 = 0
a-6*a-38-2 = 0
-5*a-40 = 0 // + 40
-5*a = 40 // : -5
a = 40/(-5)
a = -8
a = -8
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