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s in (-oo:+oo)
(1/15)*s = (1/5)*s-4 // - (1/5)*s-4
(1/15)*s-((1/5)*s)+4 = 0
(1/15)*s+(-1/5)*s+4 = 0
4-2/15*s = 0 // - 4
-2/15*s = -4 // : -2/15
s = -4/(-2/15)
s = 30
s = 30
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