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a in (-oo:+oo)
-a-(3*a)-6 = -46 // + 46
46-a-(3*a)-6 = 0
46-a-3*a-6 = 0
40-4*a = 0 // - 40
-4*a = -40 // : -4
a = -40/(-4)
a = 10
a = 10
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