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a in (-oo:+oo)
-a-3 = 5*a-27 // - 5*a-27
27-a-(5*a)-3 = 0
27-a-5*a-3 = 0
24-6*a = 0 // - 24
-6*a = -24 // : -6
a = -24/(-6)
a = 4
a = 4
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