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s in (-oo:+oo)
(3/7)*s = 4/5 // - 4/5
(3/7)*s-(4/5) = 0
(3/7)*s-4/5 = 0
3/7*s-4/5 = 0 // + 4/5
3/7*s = 4/5 // : 3/7
s = 4/5/3/7
s = 28/15
s = 28/15
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