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2014-02-19T15:08:04+02:00
A+b+c=878
a=3b
c=a-39=3b-39

3b+b+3b-39=878
7b=878+39
7b=917
b=917:7=131 =>a=3*131=393
                        c=393-39=354
PROBA: 131+393+354=878
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