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a in (-oo:+oo)
-6*a-(2*a)-8 = 8 // - 8
-6*a-(2*a)-8-8 = 0
-6*a-2*a-8-8 = 0
-8*a-16 = 0 // + 16
-8*a = 16 // : -8
a = 16/(-8)
a = -2
a = -2
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