In[]:=
Clear["Global`*"]​​EQ=1/4Subsuperscript[n,1,4]+1/2Subsuperscript[n,2,2]Subsuperscript[n,1,2]+1/4Subsuperscript[n,2,4]​​Simplify[EQ]​​FullSimplify[EQ]​​Quit[]​​​​​​
Out[]=
4
n
1
4
+
1
2
2
n
1
2
n
2
+
4
n
2
4
Out[]=
1
4

4
n
1
+2
2
n
1
2
n
2
+
4
n
2

Out[]=
1
4

4
n
1
+2
2
n
1
2
n
2
+
4
n
2
