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p in (-oo:+oo)
p-18 = (58/7)*(18-7) // - (58/7)*(18-7)
p-((58/7)*(18-7))-18 = 0
p+(-58/7)*(18-7)-18 = 0
p-764/7 = 0 // + 764/7
p = 764/7
p = 764/7
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