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a in (-oo:+oo)
-83 = 3*a+5*a-3 // - 3*a+5*a-3
3-(3*a)-(5*a)-83 = 0
3-3*a-5*a-83 = 0
-8*a-80 = 0 // + 80
-8*a = 80 // : -8
a = 80/(-8)
a = -10
a = -10
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