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b in (-oo:+oo)
b/9 = 7/8 // - 7/8
b/9-(7/8) = 0
b/9-7/8 = 0
1/9*b-7/8 = 0 // + 7/8
1/9*b = 7/8 // : 1/9
b = 7/8/1/9
b = 63/8
b = 63/8
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