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a in (-oo:+oo)
6*a-(1/8) = 91/40 // - 91/40
6*a-(1/8)-(91/40) = 0
6*a-1/8-91/40 = 0
6*a-12/5 = 0 // + 12/5
6*a = 12/5 // : 6
a = 12/5/6
a = 2/5
a = 2/5
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