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a in (-oo:+oo)
8*a-(1/2) = 6 // - 6
8*a-(1/2)-6 = 0
8*a-1/2-6 = 0
8*a-13/2 = 0 // + 13/2
8*a = 13/2 // : 8
a = 13/2/8
a = 13/16
a = 13/16
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