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s in (-oo:+oo)
(-3/7)*s = 5/14 // - 5/14
(-3/7)*s-(5/14) = 0
(-3/7)*s-5/14 = 0
-3/7*s-5/14 = 0 // + 5/14
-3/7*s = 5/14 // : -3/7
s = 5/14/(-3/7)
s = -5/6
s = -5/6
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