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P in (-oo:+oo)
P/35 = 18/30 // - 18/30
P/35-(18/30) = 0
P/35-3/5 = 0
1/35*P-3/5 = 0 // + 3/5
1/35*P = 3/5 // : 1/35
P = 3/5/1/35
P = 21
P = 21
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