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2014-11-17T18:53:10+02:00
{4x[2+(6+a):3]-17}x7=24-3
{4x[2+(6+a):3]-17}=21:7
4x[2+(6+a):3]=3+17
2+(6+a):3=20:4
6+a=5x3-2
6+a=13
a=13-6
a=7