a=x; b=x-7; c =x-14; d=x-21; e=x-28; f=x-35
[tex]x+(x-7)+(x-14)+(x-21)+(x-28)+(x-35)=171[/tex]
=>
[tex]6x-7(1+2+3+4+5)=171 \\ 6x - 7*15 = 171 \\ 6x = 171 + 105 \\ 6x = 276 \\ x = 46[/tex]
Deci:
a=46;b=39; c= 32; d = 25; e = 18; f = 11
Deci, numerele sunt 46; 39; 32; 25; 18; 11
