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a in (-oo:+oo)
a/9 = a-(1/8) // - a-(1/8)
a/9-a+1/8 = 0
1/8-8/9*a = 0 // - 1/8
-8/9*a = -1/8 // : -8/9
a = -1/8/(-8/9)
a = 9/64
a = 9/64
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