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P in (-oo:+oo)
P/3 = 7.2 // - 7.2
P/3-7.2 = 0
1/3*P-7.2 = 0 // + 7.2
1/3*P = 7.2 // : 1/3
P = 7.2/1/3
P = 21.60000022
P = 21.60000022
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