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a in (-oo:+oo)
-(6*a)-9 = 9 // - 9
-(6*a)-9-9 = 0
-6*a-9-9 = 0
-6*a-18 = 0 // + 18
-6*a = 18 // : -6
a = 18/(-6)
a = -3
a = -3
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