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x in (-oo:+oo)
P = s-(x/2) // - s-(x/2)
P-s+x/2 = 0
P-s+1/2*x = 0 // - P-s
1/2*x = -(P-s) // : 1/2
x = (-(P-s))/1/2
x = 2*(s-P)
x = 2*(s-P)
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