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P in (-oo:+oo)
P/5-(2/7) = 0
P/5-2/7 = 0
1/5*P-2/7 = 0 // + 2/7
1/5*P = 2/7 // : 1/5
P = 2/7/1/5
P = 10/7
P = 10/7
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