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H = H
P - 15 = 3H
P + 15 = 3H/2
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2P = 3H + 3H/2
2P = (6H + 3H)/2
4P = 9H
P/H = 9/4
P - 15 = 3H
9K - 15 = 3(4K)
9K - 15 = 12K
-3K = 15
K = -5
P = 9K = 9(-5) = -45
H = 4K = 4(-5) = -20