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b in (-oo:+oo)
(4/7)*b+(2/3)*b+8/9 = 914/63 // - 914/63
(4/7)*b+(2/3)*b+8/9-(914/63) = 0
(4/7)*b+(2/3)*b+8/9-914/63 = 0
26/21*b-286/21 = 0 // + 286/21
26/21*b = 286/21 // : 26/21
b = 286/21/26/21
b = 11
b = 11
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