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p in (-oo:+oo)
p/13 = 2.67 // - 2.67
p/13-2.67 = 0
1/13*p-2.67 = 0 // + 2.67
1/13*p = 2.67 // : 1/13
p = 2.67/1/13
p = 34.70999861
p = 34.70999861
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