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5p-7p = 8+12
-2p = 20
P = 20/2
P = 10
9-2p = 4p-6
-2p-4p = -9-6
-6p = -15
P = -15/-6
P = 2,5
5p-7p=12+8
-2p=20
P=20/-2
P=-10
9-2p=4p-6
-2p-4p=-6-9
-6p=-15
P=-15/-6
P=2,5