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b in (-oo:+oo)
(3/7)*b-(1/4) = 89/28 // - 89/28
(3/7)*b-(1/4)-(89/28) = 0
(3/7)*b-1/4-89/28 = 0
3/7*b-24/7 = 0 // + 24/7
3/7*b = 24/7 // : 3/7
b = 24/7/3/7
b = 8
b = 8
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