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2014-01-29T17:48:04+02:00
23-2* [15-(74-2x):4+3]=9
2*[15-(74-2x):4+3]=23-9=14
15-(74-2x):4+3 = 14:2=7
15-(74-2x):4=7-3=4
(74-2x):4=15-4=11
74-2x=11*4=44
2x=74-44
2x=30
x=30:2
x=15