Solve the following system of linear equations { ?1 + ?2 + ?3 = ? ?1 + (1 +

Solve the following system of linear equations
{
?1 + ?2 + ?3 = ?
?1 + (1 + ?)?2 + ?3 = 2? ? ? 0
?1 + ?2 + (1 + ?)?3 = 3?