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b in (-oo:+oo)
b/12 = 6/8 // - 6/8
b/12-(6/8) = 0
b/12-3/4 = 0
1/12*b-3/4 = 0 // + 3/4
1/12*b = 3/4 // : 1/12
b = 3/4/1/12
b = 9
b = 9
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