Latex code not working

LaTeX requires a valid delimiter for both \left and \right. If you want an empty \left, you’ll need to use a .:

[latex]\left . A \right\}[/latex]

[latex]\left . \begin{matrix} A \\ B \\ C \end{matrix} \right\} [/latex]

See, for example, https://www.giss.nasa.gov/tools/latex/ltx-403.html

Michael! First of all sorry for the late response. I was on vacation.

Thanks Michael for your response. It was really helpful and fixed the issue.

Now I have another issue. The following latex code does not work:

[latex]\frac { 7 }{ \frac { 3 }{ 4 } } [/latex]

Actually I want to write something like this:
[latex]\frac { 1 }{ 1+\frac { 1 }{ 4 } } -\frac { 1 }{ 1+\frac { 2 }{ 3 } } =[/latex]

All these latex code works on https://www.codecogs.com/latex/eqneditor.php

Kindly help to get this issue fixed.

Both work for me. For the second one, the resulting image I get is:

https://s0.wp.com/latex.php?latex=%5Cfrac+%7B+1+%7D%7B+1%2B%5Cfrac+%7B+1+%7D%7B+4+%7D++%7D+-%5Cfrac+%7B+1+%7D%7B+1%2B%5Cfrac+%7B+2+%7D%7B+3+%7D++%7D+%3D&bg=ffffff&fg=333333&s=0&zoom=2

What do you see?

What site are you trying to add LaTeX to?

I am very sorry! I was not closing the shortcode properly. It is working.

I have another question now. The generated image has very small text and the the numbers are not seen properly. However is your link the image has bigger text. How did you achieve that?

I am editing content of the following link:

https://scoopgmat.com/challenge-of-the-day/problem-solving/question-15

You can add an s parameter to the shortcode to make the size larger:

[latex s=3]\frac { 7 }{ \frac { 3 }{ 4 } } [/latex]

(The default value for s is 0 and it goes up to 4.)

You can also try using \displaystyle to make some complicated expressions more clear.

[latex]\displaystyle \frac { 7 }{ \frac { 3 }{ 4 } } [/latex]

Wow! You made my day. Thank you so much Michael.