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p in (-oo:+oo)
90/109.2 = p/120 // - p/120
90/109.2-(p/120) = 0
0.82417582-1/120*p = 0 // - 0.82417582
-1/120*p = -0.82417582 // : -1/120
p = -0.82417582/(-1/120)
p = 98.90113796
p = 98.90113796
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