"It a dealing" can be simplified to "transaction" or "business deal". Other synonyms include "negotiation", "exchange", "trade", "bargain", "sale", "purchase", "commerce", and "contract". These words all describe the act of buying or selling goods or services, and imply a certain level of agreement and exchange of value between two parties. It is important to choose the right synonym depending on the context and tone of the conversation or writing, as some words carry a more formal or legal connotation than others.