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s in (-oo:+oo)
(1/15)*s = 1/5-4 // - 1/5-4
(1/15)*s-(1/5)+4 = 0
(1/15)*s-1/5+4 = 0
1/15*s+19/5 = 0 // - 19/5
1/15*s = -19/5 // : 1/15
s = -19/5/1/15
s = -57
s = -57
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