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a in (-oo:+oo)
5*a+1/8 = 161/8 // - 161/8
5*a+1/8-(161/8) = 0
5*a+1/8-161/8 = 0
5*a-20 = 0 // + 20
5*a = 20 // : 5
a = 20/5
a = 4
a = 4
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