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2014-03-05T19:24:43+02:00
2a+b+c+a+2b+c+a+b+2c=4a+4b+4c=142+144+144=430⇔4(a+b+c)=430⇔a+b+c=107,5⇔
a=142-107,5⇔a=34.5.