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s in (-oo:+oo)
s/5 = 12.1 // - 12.1
s/5-12.1 = 0
1/5*s-12.1 = 0 // + 12.1
1/5*s = 12.1 // : 1/5
s = 12.1/1/5
s = 60.5
s = 60.5
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