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a in (-oo:+oo)
a-5 = 3*a-27 // - 3*a-27
a-(3*a)-5+27 = 0
a-3*a-5+27 = 0
22-2*a = 0 // - 22
-2*a = -22 // : -2
a = -22/(-2)
a = 11
a = 11
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