To 'agree with' someone, is to think they are right. To 'agree to' something, is to accept a proposal.
During a business conversation or negotiation, you could use these phrases to agree to a proposal:
"That would be acceptable."
"We can agree to that."
"We would be agreeable to that."
If you disagree with a proposal, you could say:
"That wouldn't be acceptable I'm afraid."
"I'm afraid we...
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How to agree or disagree