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a in (-oo:+oo)
33 = 2*a+6*a+9 // - 2*a+6*a+9
33-(2*a)-(6*a)-9 = 0
33-2*a-6*a-9 = 0
24-8*a = 0 // - 24
-8*a = -24 // : -8
a = -24/(-8)
a = 3
a = 3
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