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a in (-oo:+oo)
a/8-(5/8) = 3 // - 3
a/8-(5/8)-3 = 0
a/8-5/8-3 = 0
1/8*a-29/8 = 0 // + 29/8
1/8*a = 29/8 // : 1/8
a = 29/8/1/8
a = 29
a = 29
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