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s in (-oo:+oo)
s/4 = -2.5 // + 2.5
s/4+2.5 = 0
1/4*s+2.5 = 0 // - 2.5
1/4*s = -2.5 // : 1/4
s = -2.5/1/4
s = -10
s = -10
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