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P in (-oo:+oo)
P/3 = 6.3 // - 6.3
P/3-6.3 = 0
1/3*P-6.3 = 0 // + 6.3
1/3*P = 6.3 // : 1/3
P = 6.3/1/3
P = 18.90000019
P = 18.90000019
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