Răspuns :
x-y=65
2x-38=y
2x-y=38
x+x-y=38
x+65=38
x=38-65
x=-27
-27-y=65
-y=65+27
-y=92
y=-92
-27+92=65
2x-38=y
2x-y=38
x+x-y=38
x+65=38
x=38-65
x=-27
-27-y=65
-y=65+27
-y=92
y=-92
-27+92=65