a+b+c = 227
a-x=122 -> a = 122+x
b-x=38 -> b = 38+x
c-x=47 -> c = 47+x
122+x+38+x+47+x=227
207+3x=227
3x=20 -> x=20/3 ->
a = 122+20/3=(366+20)/3=386/3
b = 38+20/3=(114+20)/3=134/3
c = 47+20/3=(141+20)/3=161/3
(386+134+161)/3=227
Sper ca te-am ajutat :)