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p in (-oo:+oo)
p-18 = (5/2)*(18-4) // - (5/2)*(18-4)
p-((5/2)*(18-4))-18 = 0
p+(-5/2)*(18-4)-18 = 0
p-53 = 0 // + 53
p = 53
p = 53
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