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