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b in (-oo:+oo)
(4/7)*b+1/2 = 55/14 // - 55/14
(4/7)*b+1/2-(55/14) = 0
(4/7)*b+1/2-55/14 = 0
4/7*b-24/7 = 0 // + 24/7
4/7*b = 24/7 // : 4/7
b = 24/7/4/7
b = 6
b = 6
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