Question

$\frac{a}{57} = \frac{1}{19} solve \: the \: problem$
​

Answer 1

Answer:

19a = 57

a = 3

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

As Au101 already pointed out: There was a } missing and according to Ian Thompson a { too much. (Sorry Ian, for having missed your comment.)

Also, for this code to compile, you don't need any extra package in your MWE. Instead the \begin{document} ... \end{document} was missing.

To get nicer braces, you should use \left and \right before the (). Remember: you have to use \left and \right always in combination. You can't use the one without the other. The delimiters though don't have to match. You can combine \left( with \right\updownarrow, just to name an example. Hence, I also added those.

Example Code

\documentclass[11pt,a4paper, oneside]{article}

\begin{document}

\begin{equation}

D_3 = -10 \log \left(\frac{P_2(2 f_{1,2} \pm f_{2,1})}

{P_2(f_1,f_2)}\right)

\label{eq6}

\end{equation}

\end{document}

Result

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