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a in (-oo:+oo)
-3*a-8 = 6*a-116 // - 6*a-116
116-3*a-(6*a)-8 = 0
116-3*a-6*a-8 = 0
108-9*a = 0 // - 108
-9*a = -108 // : -9
a = -108/(-9)
a = 12
a = 12
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