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2014-02-04T22:38:30+02:00
[ 3 + ( a + 2 ) : 2 ] * 4 - 8 = 32
[ 3 + ( a + 2 ) : 2 ] * 4 = 32 + 8 = 40
3 + ( a + 2 ) : 2 = 40 : 4 = 10
( a + 2 ) : 2 = 10 - 3 = 7
a + 2 = 7 * 2 = 14
a = 14 - 2 
a = 12