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a in (-oo:+oo)
2*a-(6*a)+3 = 27 // - 27
2*a-(6*a)-27+3 = 0
2*a-6*a-27+3 = 0
-4*a-24 = 0 // + 24
-4*a = 24 // : -4
a = 24/(-4)
a = -6
a = -6
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