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a in (-oo:+oo)
a-2 = 3*a+8 // - 3*a+8
a-(3*a)-8-2 = 0
a-3*a-8-2 = 0
-2*a-10 = 0 // + 10
-2*a = 10 // : -2
a = 10/(-2)
a = -5
a = -5
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