2) 3 + 9 - 5 = + - = = = 7
4) 5 + 11 - 4 = + - = = = 12 = 12 = 12,5
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2) 3 + 9 - 5 = + - = = = 7
4) 5 + 11 - 4 = + - = = = 12 = 12 = 12,5