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a in (-oo:+oo)
-6*a-9 = 4*a-119 // - 4*a-119
119-6*a-(4*a)-9 = 0
119-6*a-4*a-9 = 0
110-10*a = 0 // - 110
-10*a = -110 // : -10
a = -110/(-10)
a = 11
a = 11
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