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b in (-oo:+oo)
(3/5)*b = 7/5 // - 7/5
(3/5)*b-(7/5) = 0
(3/5)*b-7/5 = 0
3/5*b-7/5 = 0 // + 7/5
3/5*b = 7/5 // : 3/5
b = 7/5/3/5
b = 7/3
b = 7/3
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