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b in (-oo:+oo)
b/13 = 3/7.8 // - 3/7.8
b/13-(3/7.8) = 0
b/13-0.38461538 = 0
1/13*b-0.38461538 = 0 // + 0.38461538
1/13*b = 0.38461538 // : 1/13
b = 0.38461538/1/13
b = 4.99999974
b = 4.99999974
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