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b in (-oo:+oo)
(4/7)*b = 8/35 // - 8/35
(4/7)*b-(8/35) = 0
(4/7)*b-8/35 = 0
4/7*b-8/35 = 0 // + 8/35
4/7*b = 8/35 // : 4/7
b = 8/35/4/7
b = 2/5
b = 2/5
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