Răspuns :
a+b+c=69
c=4*b
a=c+6=>a=4b+6
a+b+c=4b+6+b+4b=9b+6=69
9b+6=69=>9b=63=>b=63:9=7
a=4b+6=4*7+6=28+6=34
c=4b=4*7=28
c=4*b
a=c+6=>a=4b+6
a+b+c=4b+6+b+4b=9b+6=69
9b+6=69=>9b=63=>b=63:9=7
a=4b+6=4*7+6=28+6=34
c=4b=4*7=28