I was trying to enlarge a bit some equations, and I tried EVERYTHING.

\large \Large \begin{large} \mathlarger.. 

None of those commands work. I don't know what to try. 
Does anyone have some idea?

If this help, here is my LaTeX "starting code":

```
\documentclass[danish, a4paper, 12pt]{report}
%\documentclass{article}
\usepackage[paperheight=28cm, paperwidth=20cm, margin=2cm]{geometry}
\usepackage[T1]{fontenc}
\usepackage[urw-garamond]{mathdesign}
\usepackage[english]{babel}
%\usepackage[italian]{babel}
\usepackage[utf8]{inputenc}
\usepackage[usenames,dvipsnames]{color}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{multicol}
\usepackage{tabularx}
\usepackage{amsopn}
\usepackage{xparse}
\usepackage{physics}
\usepackage{wasysym}
\usepackage{pstricks}
\usepackage{pspicture}
\usepackage{mathrsfs}
\graphicspath{{"Immagini/"}}
\usepackage{mathtools}
\DeclarePairedDelimiter\ceil{\lceil}{\rceil}
\DeclarePairedDelimiter\floor{\lfloor}{\rfloor}
\definecolor{ballblue}{rgb}{0.13, 0.67, 0.8}
\definecolor{apple}{rgb}{0.55, 0.71, 0.0}
\definecolor{awesome}{rgb}{1.0, 0.13, 0.32}
\definecolor{azure}{rgb}{0.0, 0.5, 1.0}
\newcommand\Large{\@setfontsize\Large\@xviipt{22}}
\DeclareMathOperator{\de}{\text{d}}
\newenvironment{sistema}%
{\left\lbrace\begin{array}{@{}l@{}}}%
{\end{array}\right.}
\renewcommand\theequation{\arabic{equation}}

\begin{document}

cui e chiesto un tempo $t^*$ per il quale il peso e il doppio, ossia
$$P(t^*)=2P_0$$
Si agisce come prima, solo che in questo caso l'incognita è il tempo,
e si scrive
$$2P_0 = \scalebox{2}{e^{\frac{\ln(1.4)}{30}\ t^*}}$$

\end{document}

```

As you can see, I also tried with 

```
\newcommand\Large{\@setfontsize\Large\@xviipt{22}}

```

and nothing happens...

After having tried with "scale box" and after having failed again... here is a screenshot of the log.

[![enter image description here](https://i.stack.imgur.com/vcKN3.png)](https://i.stack.imgur.com/vcKN3.png)