5 1/2 - 0,(3) x
--------------- =----- (introducem intregii si scriem nr zecimale ca fractii ordinare
0,(6)+0,4 2
11/2 -1/3 x
------------ = ---- (aducem la acelasi numitor si facem calculele)
2/3+2/5 2
33/6-2/6 x
---------------=----
10/15+6/15 2
31/6 x
------=-----
16/15 2
x/2=31/6:16/15
x/2=31/6·15/16
x/2=31·15/6·16
x=2·31·15/6·16
x=31·15/3·16
x=31·5/16
x=155/16