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a in (-oo:+oo)
a/8 = 15/20 // - 15/20
a/8-(15/20) = 0
a/8-3/4 = 0
1/8*a-3/4 = 0 // + 3/4
1/8*a = 3/4 // : 1/8
a = 3/4/1/8
a = 6
a = 6
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