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b in (-oo:+oo)
b/9-(1/2) = 3/8 // - 3/8
b/9-(1/2)-(3/8) = 0
b/9-1/2-3/8 = 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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