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