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a in (-oo:+oo)
-3*a-2 = 5*a+54 // - 5*a+54
-3*a-(5*a)-54-2 = 0
-3*a-5*a-54-2 = 0
-8*a-56 = 0 // + 56
-8*a = 56 // : -8
a = 56/(-8)
a = -7
a = -7
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