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p in (-oo:+oo)
(300-(200*p))/1.22 = 72 // - 72
(300-(200*p))/1.22-72 = 0
(300-200*p)/1.22-72 = 0
(300-200*p)/1.22+(-72*1.22)/1.22 = 0
300-200*p-72*1.22 = 0
212.16-200*p = 0
(212.16-200*p)/1.22 = 0
(212.16-200*p)/1.22 = 0 // * 1.22
212.16-200*p = 0
212.16-200*p = 0 // - 212.16
-200*p = -212.16 // : -200
p = -212.16/(-200)
p = 1.0608
p = 1.0608
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