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I'm a beginner at LaTeX and I get a LaTeX error when I type this:

\begin{equation}
{$k = \frac{\Delta U}{\Delta I} $}
\end{equation}

Could someone tell me what to do?

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    You don't need $ in an equation environment, so just remove them and try again. :)
    – awllower
    Commented Sep 28, 2016 at 17:16
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    I'm voting to close this question as off-topic because it's a simple typo. $ does not belong inside the equation environment. Commented Sep 28, 2016 at 17:16
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    @HenriMenke To be fair, I don't think it's a typo, but a beginner's misunderstanding. That said, I'm sure it's a duplicate multiple times over
    – Au101
    Commented Sep 28, 2016 at 17:17
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    As said by @awllower you must not have $ within the equation environment, equation is a math mode environment. You also don't need { ... } around the whole lot, they aren't doing anything for you
    – Au101
    Commented Sep 28, 2016 at 17:18

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