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s in (-oo:+oo)
212-((3/10)*s) = 5*s // - 5*s
212-((3/10)*s)-(5*s) = 0
(-3/10)*s-5*s+212 = 0
212-53/10*s = 0 // - 212
-53/10*s = -212 // : -53/10
s = -212/(-53/10)
s = 40
s = 40
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