2[4/3y—(2/3y—1/2)]=3/4y急·································!1

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2[4/3y—(2/3y—1/2)]=3/4y急·································!12[4/3y—(2/3y—1/2)]=3/4y急·················

2[4/3y—(2/3y—1/2)]=3/4y急·································!1
2[4/3y—(2/3y—1/2)]=3/4y
急·································!1

2[4/3y—(2/3y—1/2)]=3/4y急·································!1
2[4/3y—(2/3y—1/2)]=3/4y
8/3y—2(2/3y—1/2)=3/4y
8/3y—4/3y+1=3/4y
4/3y+1=3/4y
4/3y-3/4y=-1
16/12y-9/12y=-1
7/12y=-1
y=12/7