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2014-11-03T12:25:51+02:00
A+b+c=123
b-2=3*a
c=(a+b)/2
a+3a+2+(a+b)/2=123 l -2
4a+(a+b)/2=121
4a+(a+3a+2)/2=121
4a+(4a+2)/2=121
4a+2a+1=121 l-1
6a=120 l :6
a=20
b=3*a+2=62
c=(20+62):2=41
20+62+41=123
2014-11-03T13:42:15+02:00