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b in (-oo:+oo)
(5/7)*b+1/4 = 47/28 // - 47/28
(5/7)*b+1/4-(47/28) = 0
(5/7)*b+1/4-47/28 = 0
5/7*b-10/7 = 0 // + 10/7
5/7*b = 10/7 // : 5/7
b = 10/7/5/7
b = 2
b = 2
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