Answer:
3/4a-1/3b
OR
-1/3b+3/4a
Explanation:
copy this and translate it, because I can't talk this language
add like terms 1/2a+1/4a=2/4a+1/4a=3/4a
then you write -1/3b itself because it don't have like terms
the final answer will be:
3/4a-1/3b
OR
-1/3b+3/4a