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P in (-oo:+oo)
P/7 = 3/4 // - 3/4
P/7-(3/4) = 0
P/7-3/4 = 0
1/7*P-3/4 = 0 // + 3/4
1/7*P = 3/4 // : 1/7
P = 3/4/1/7
P = 21/4
P = 21/4
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