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I sent 2.2 bitcoins using the old version of multibit application (0.5.18)

The commission is not calculated correctly. Therefore, the transaction can be confirmed forever.

What can I do to cancel a transaction?

I read about a "double-spend" and other solutions to the problem, but what should I do step by step (because I used a multibit).

Try to export keys and install bitcoin core?

Is the transaction self-canceled if I do nothing?

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