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I got this error.

Error: failed to send transaction: Transaction simulation failed: Error processing Instruction 0: sum of account balances before and after instruction do not match

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Problem solved✔️

In my case I had a function that had two shipments of balances. One through the system program with transfer and another through try_borrow_mut_lamports()?.

First you have to put the transfer function and then the try_borrow_mut_lamports() function

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  • thank God for you
    – Artur Sapek
    Commented Jun 6 at 1:20

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