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Questions tagged [prefix-argument]

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Replace formula by computed value

I'd like to select a simple formula like 17+5 and replace that by the computed result, 22 in this case. And I need this to work during keyboard macro execution, to quickly process large portions of my ...
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What does C-u mean in sequence “C-u M-x”

I learnt that C-u default is to repeat 4 times. For example: C-u t is input tttt However, when I type C-u M-x, it prompts a function list What does invoking C-u mean here?