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b in (-oo:+oo)
(2/35)*b = 4/5 // - 4/5
(2/35)*b-(4/5) = 0
(2/35)*b-4/5 = 0
2/35*b-4/5 = 0 // + 4/5
2/35*b = 4/5 // : 2/35
b = 4/5/2/35
b = 14
b = 14
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