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s in (-oo:+oo)
(1/2)*s = 1.6 // - 1.6
(1/2)*s-1.6 = 0
1/2*s-1.6 = 0 // + 1.6
1/2*s = 1.6 // : 1/2
s = 1.6/1/2
s = 3.2
s = 3.2
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