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b in (-oo:+oo)
(3/8)*b+(2/8)*b = 4.25 // - 4.25
(3/8)*b+(2/8)*b-4.25 = 0
5/8*b-4.25 = 0 // + 4.25
5/8*b = 4.25 // : 5/8
b = 4.25/5/8
b = 6.8
b = 6.8
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