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