Răspuns :
A+b+c=?
B=2a
c:a=5 rest 7-> c=5a+7
c-a=39
5a+7-a=39
4a=32
a=8->c=47->b=16
a+b+c=8+47+16
a+b+c=71
[tex]y=2x \\ z:x=5 \ rest \ 7 \\ z-x=39 \\ z=5x+7 \\ 5x-7-x=39 \\ 4x=32 \\ x=32:4 \\ \boxed{x=8} \\ y=2*8 \\ \boxed{y=16} \\ z=5*8+7 \\ z=40+7 \\ \boxed{z=47} \\ \boxed{Suma: \ \boxed{8+16+47=24+47=\boxed{71}}}[/tex]