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p in (-oo:+oo)
p-18 = (27/5)*(18-4) // - (27/5)*(18-4)
p-((27/5)*(18-4))-18 = 0
p+(-27/5)*(18-4)-18 = 0
p-468/5 = 0 // + 468/5
p = 468/5
p = 468/5
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