|...........a...............|
|............................|............b...........| | :2
|....c....| | x3
|...........d...............|...4...| | -4
|.............e......|..5..| | +5
b=2a
c=a/3
d=a+4
e=a-5
a+b+c+d+e=255
a+2a+a/3+a+4+a-5=255 aducem la acelasi numitor
3a+6a+a+3a+12+3a-15=765
16a-3=765
16a=765+3
16a=768
a=768:16
a=48
b=2*48=96
c=48/3=16
d=48+4=52
e=48-5=43