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a in (-oo:+oo)
-11 = 3*a+a+5 // - 3*a+a+5
-(3*a)-a-11-5 = 0
-3*a-a-11-5 = 0
-4*a-16 = 0 // + 16
-4*a = 16 // : -4
a = 16/(-4)
a = -4
a = -4
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