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p in (-oo:+oo)
p-18 = (16/3)*(20-6) // - (16/3)*(20-6)
p-((16/3)*(20-6))-18 = 0
p+(-16/3)*(20-6)-18 = 0
p-278/3 = 0 // + 278/3
p = 278/3
p = 278/3
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