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=> 7,5(32) + 7P = 7,25 (32 + P)
=> 240 + 7P = 232 + 7,25P
=> 7P - 7,25P = 232 - 240
=> -0,25P = -8
=> P = -8/-0,25 = 32
7,25 - 2,25 = 30