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s in (-oo:+oo)
(-3/5)*s = -40 // + 40
(-3/5)*s+40 = 0
40-3/5*s = 0 // - 40
-3/5*s = -40 // : -3/5
s = -40/(-3/5)
s = 200/3
s = 200/3
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