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a in (-oo:+oo)
11 = 4*a-a+5 // - 4*a-a+5
a-(4*a)-5+11 = 0
a-4*a-5+11 = 0
6-3*a = 0 // - 6
-3*a = -6 // : -3
a = -6/(-3)
a = 2
a = 2
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