1

I want to add some blank spaces to my margin when i go to a new line.
The second " = " sign should be just below the first " = "
How can i do that?

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1

You are looking for environments provided in the amsmath package. Here, I use aligned to make certain tab-points align at the & tokens. In this case, the equations are not numbered. If you need numbering, use the align environment without the surrounding \[...\] delimiters.

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\[
\begin{aligned}
f(n) &= \log(n^n)^3\\
     &= \log(n^{3n})
\end{aligned}
\]

\end{document}

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