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s in (-oo:+oo)
s/2 = -0.2 // + 0.2
s/2+0.2 = 0
1/2*s+0.2 = 0 // - 0.2
1/2*s = -0.2 // : 1/2
s = -0.2/1/2
s = -0.4
s = -0.4
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