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2014-11-02T20:11:33+02:00
2,8=28/10=simplif=14/5
2=[(14/5)·5+(3/7)·14+x·2]/(5+14+2)
2=(14+6+2x)/21
2=(20+2x)/21
20+2x=2·21
2x=42-20
2x=22
x=22/2
x=11
10 3 10