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a in (-oo:+oo)
5-3*a-(5*a) = -83 // + 83
5-3*a-(5*a)+83 = 0
5-3*a-5*a+83 = 0
88-8*a = 0 // - 88
-8*a = -88 // : -8
a = -88/(-8)
a = 11
a = 11
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