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a in (-oo:+oo)
-33 = 6*a-(2*a)+3 // - 6*a-(2*a)+3
2*a-(6*a)-33-3 = 0
2*a-6*a-33-3 = 0
-4*a-36 = 0 // + 36
-4*a = 36 // : -4
a = 36/(-4)
a = -9
a = -9
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