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s in (-oo:+oo)
(3/10)*s = (6/1)/5 // - (6/1)/5
(3/10)*s-((6/1)/5) = 0
(3/10)*s-6/5 = 0
3/10*s-6/5 = 0 // + 6/5
3/10*s = 6/5 // : 3/10
s = 6/5/3/10
s = 4
s = 4
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