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a in (-oo:+oo)
-6*a-1 = 4*a+109 // - 4*a+109
-6*a-(4*a)-109-1 = 0
-6*a-4*a-109-1 = 0
-10*a-110 = 0 // + 110
-10*a = 110 // : -10
a = 110/(-10)
a = -11
a = -11
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