Răspuns :
a+b+c+d+e+f+g=171
a
b=a-7
c=b-7=a-7-7=a-14
d=c-7=a-7-7-7=a-21
e=d-7=a-7-7-7-7=a-28
f=e-7=a-7-7-7-7-7=a-35
a+a-7+a-14+a-21+a-28+a-35=171
6a=171+7+14+21+28+35=276
a=276/6=46
46-7 =39
46-14=32
46-21=25
46-28=18
46-35=11
verificare 11+18+25+32+39+46=171
a
b=a-7
c=b-7=a-7-7=a-14
d=c-7=a-7-7-7=a-21
e=d-7=a-7-7-7-7=a-28
f=e-7=a-7-7-7-7-7=a-35
a+a-7+a-14+a-21+a-28+a-35=171
6a=171+7+14+21+28+35=276
a=276/6=46
46-7 =39
46-14=32
46-21=25
46-28=18
46-35=11
verificare 11+18+25+32+39+46=171