[질문] x=2,y=-2일때 x/3-y=x+a/2 일때a의값은?

2/3-(-6/3)=2+a/2, 2/3+6/3=2+a/2, 8/3=6/3+a/2, 8/3-6/3=a/2, 2/3=a/2 , 2x2=3a, 4=3a, a=4/3 입니다.^^