85 x 30 = 82P + 87(30 - P)
2.550 = 82P + 2.610 - 87P
2.610 - 2.550 = 82p - 87P
60 = 5P
12 = P
P = 12
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85 x 30 = 82P + 87(30 - P)
2.550 = 82P + 2.610 - 87P
2.610 - 2.550 = 82p - 87P
60 = 5P
12 = P
P = 12