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P in (-oo:+oo)
P/7 = 4/7 // - 4/7
P/7-(4/7) = 0
P/7-4/7 = 0
1/7*P-4/7 = 0 // + 4/7
1/7*P = 4/7 // : 1/7
P = 4/7/1/7
P = 4
P = 4
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