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s in (-oo:+oo)
4 = (1/5)*s-7 // - (1/5)*s-7
4-((1/5)*s)+7 = 0
(-1/5)*s+4+7 = 0
11-1/5*s = 0 // - 11
-1/5*s = -11 // : -1/5
s = -11/(-1/5)
s = 55
s = 55
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