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a in (-oo:+oo)
a+3 = 5*a+11 // - 5*a+11
a-(5*a)-11+3 = 0
a-5*a-11+3 = 0
-4*a-8 = 0 // + 8
-4*a = 8 // : -4
a = 8/(-4)
a = -2
a = -2
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