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s in (-oo:+oo)
(30/10)*s = 35/5 // - 35/5
(30/10)*s-(35/5) = 0
(30/10)*s-7 = 0
3*s-7 = 0 // + 7
3*s = 7 // : 3
s = 7/3
s = 7/3
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