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1)
P = (a + b) * h : 2 |*2
2P = (a + b) * h |:(a + b)
2P : (a + b) = h
2)
P = (a + b) * h : 2 |*2
2P = (a + b) * h |:h
2P : h = a + b |-b
2P : h - b = a