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P in (-oo:+oo)
P/90 = 8/18 // - 8/18
P/90-(8/18) = 0
P/90-4/9 = 0
1/90*P-4/9 = 0 // + 4/9
1/90*P = 4/9 // : 1/90
P = 4/9/1/90
P = 40
P = 40
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