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2014-11-05T15:59:08+02:00
A = 18 + 2 * {[72 - 322 - 19]} * 2 + (31+ 15) * 23} = 18 + 2 *(-  269) * 2  + 46 * 23 = 
18 - 1076  + 1058 = 1076 - 1076 = 0