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p in (-oo:+oo)
p-40 = (5/3)*(20-7) // - (5/3)*(20-7)
p-((5/3)*(20-7))-40 = 0
p+(-5/3)*(20-7)-40 = 0
p-185/3 = 0 // + 185/3
p = 185/3
p = 185/3
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