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2014-02-02T22:45:27+02:00
A+b+c+d=448
b=a+2
c=b+2=a+4
d=c+2=b+6
a+b+c+d=a+a+2+a+4+a+6=4a+12
4a+12=448
a=(448-12)/4=109
a=109
b=111
c=113
d=115