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a in (-oo:+oo)
9-(6*a)-(5*a) = -24 // + 24
9-(6*a)-(5*a)+24 = 0
9-6*a-5*a+24 = 0
33-11*a = 0 // - 33
-11*a = -33 // : -11
a = -33/(-11)
a = 3
a = 3
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