LaTeX.org

I'd like to recommend using the second solution with the alignat environment: \documentclass{article} \usepackage[most]{tcolorbox}% option most loads amsmath \begin{document} \begin{align*} \bar{v} & = \frac{s_{uk}}{t_{uk}}\\ \left.\begin{aligned} s_{uk} &= s_1 + s_2 \\ t_{uk} &= t_1 + t...

Please post a complete minimal working example with the added alignat environment (in your case the starred version) that generates the error message.

The content of the last equation environment is different from the output in the attached figures. You can replace the three equation environments by an alignat environment. The mathmode document by Mr. Voß on CTAN may help to understand how this and other environments of the mathematical mode work.

The section 17.10.3 "The Pin Option" may help you.

In several denominators one opening brace is too much. The first occurance: error-prone $= 2 - \frac {(k+ k^{2} +2k+1)}{{(k)(k+1)^2}$ error-free $= 2 - \frac {(k+ k^{2} +2k+1)}{(k)(k+1)^2}$ Also, for a one-digit number in the exponent, you don't have to use parentheses, but if you do, use a couple o...

Please offer a complete minimal working example as marked code. It doesn't exactly invite the helpers to deal with a topic if they have to type something out first.

About the issue: I would put each symbol in a column.

Please mark your code. You still have to decide if the entries for the table of figures and tables should be in the table of contents on the chapter and or section level. OT: There are packages in your preamble whose relationship to hyperref is unknown to me. In most cases, it is advisable to load t...

Without a minimal working example, one can only make assumptions.

Are you loading the tocbibind package in the preamble?

OT: The one-sided printing is the default setting of the report class.

Please link your crossposts.

You can use the text width option instead.