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P in (-oo:+oo)
P/7 = 2.8 // - 2.8
P/7-2.8 = 0
1/7*P-2.8 = 0 // + 2.8
1/7*P = 2.8 // : 1/7
P = 2.8/1/7
P = 19.60000039
P = 19.60000039
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