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P in (-oo:+oo)
(P-8)/2 = 10 // - 10
(P-8)/2-10 = 0
(P-8)/2+(-10*2)/2 = 0
P-10*2-8 = 0
P-28 = 0
(P-28)/2 = 0
(P-28)/2 = 0 // * 2
P-28 = 0
P-28 = 0 // + 28
P = 28
P = 28
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