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s in (-oo:+oo)
(s+7)/5 = -4 // + 4
(s+7)/5+4 = 0
(s+7)/5+(4*5)/5 = 0
s+4*5+7 = 0
s+27 = 0
(s+27)/5 = 0
(s+27)/5 = 0 // * 5
s+27 = 0
s+27 = 0 // - 27
s = -27
s = -27
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