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p in (-oo:+oo)
p/3.6 = 7.28 // - 7.28
p/3.6-7.28 = 0
0.27777778*p-7.28 = 0 // + 7.28
0.27777778*p = 7.28 // : 0.27777778
p = 7.28/0.27777778
p = 26.20799979
p = 26.20799979
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