def remove_unbalance(s):
    last_open = s.rfind("(")
    last_close = s.rfind(")")
    return s[:last_open] if last_open > last_close else s

print(remove_unbalance("aaaa(bbbb)(ccccc"))
# aaaa(bbbb)

print(remove_unbalance("esdfd((esdf)(esdf"))
# esdfd((esdf)