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2014-01-30T18:53:59+02:00
2014-01-30T18:54:06+02:00
(7x9-xx5)-9:3=20
(63-xx5)-3=20
63-xx5-3=20
xx5-3=63-20
xx5-3=43
xx5=43-3
xx5=40
x=40:5
x=8
3 4 3