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here it is my solution


\begin{equation*}
\begin{array}{cccllllc}
x_0 & & &+\frac{7}{22}x_3 &+\frac{5}{22}x_4 & &=&\frac{21}{2}\\[1ex]
&x_1 & &+\frac{3}{22}x_3 &-\frac{1}{22}x_4 & &=&\frac{7}{2}\\[1ex]
& &x_2 &+\frac{1}{22}x_3 &+\frac{7}{22}x_4 & &=&\frac{7}{2}\\[1ex]
& & &+\frac{3}{2}x_3 ...

sorry.

here is the minimal compilable code


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

\usepackage[italian]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[]{graphicx}
\usepackage{tikz}
\usepackage{pgfplots}
\usepackage{subfigure}
\usepackage{float}
\usepackage[bf ...

Hi,

i'm new. I use MikTEX 2.8 and Led editor.

Many thanks to all topics, i found them very usefull soooo many times.

Here it is the question:
After writing all i need in the preamble i type this code

\begin{figure}[H]
\centering

%GRAPH OPTIONS
\pgfplotsset{
legend style = {font=,
at={(2 ...