Question 43320
The matrix you have provided represents the following set of linear equations:
{{{1*x + 0*y + 0*z = 7}}} or {{{x = 7}}} 
{{{0*x + 1*y + 0*z = -3}}} or {{{y = -3}}}
{{{0*x + 0*y + 2*z = 6}}} or {{{2z = 6}}} or {{{z = 6/2 = 3}}}


Thus we have got the values of unknowns: x = 7, y = -3, z = 3.