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a in (-oo:+oo)
a-(3*a)-5 = -11 // + 11
a-(3*a)-5+11 = 0
a-3*a-5+11 = 0
6-2*a = 0 // - 6
-2*a = -6 // : -2
a = -6/(-2)
a = 3
a = 3
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