## Introduction

A linear equation in variables x_{1}, x_{2}, ..., x_{n} is of the form

a

_{1}x_{1}+ a_{2}x_{2}+ ... + a_{n}x_{n}= bwhere the coefficients are

a

_{1}, a_{2}, ..., a_{n}and the right side b are numbers.

A linear equation in variables x_{1}, x_{2}, ..., x_{n} is of the form

a_{1}x_{1} + a_{2}x_{2} + ... + a_{n}x_{n} = b

where the coefficients are

a_{1}, a_{2}, ..., a_{n}

and the right side b are numbers.