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b in (-oo:+oo)
29/30 = b+4/5 // - b+4/5
29/30-b-(4/5) = 0
29/30-b-4/5 = 0
1/6-b = 0 // - 1/6
-b = -1/6 // * -1
b = 1/6
b = 1/6
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