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a in (-oo:+oo)
8 = a+3*a-8 // - a+3*a-8
8-a-(3*a)+8 = 0
8-a-3*a+8 = 0
16-4*a = 0 // - 16
-4*a = -16 // : -4
a = -16/(-4)
a = 4
a = 4
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