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P in (-oo:+oo)
P/17 = 12/30 // - 12/30
P/17-(12/30) = 0
P/17-2/5 = 0
1/17*P-2/5 = 0 // + 2/5
1/17*P = 2/5 // : 1/17
P = 2/5/1/17
P = 34/5
P = 34/5
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