I have WA#3. Can you give more tests, please? Otherwise I couldn't find my mistake

CO2
1
(O)2C


Answer is:

CO2==(O)2C

This one helped me alot:
6C
12
6C
C6
((((C)6)))
((C3)2)
2C3
CCCCCC
C2C3C
2CC2
C+C+C+C+C+C
(C)+(C)+(C)+(C)+(C)+(C)
(C)(C)(C)(C)(C)(C)
2(C(C))+(C)(C)

All the answers the same '=='.