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is it matrices or which topic

Look at equation 1 where you see the term 1y or just y
isolate that y to get
3x+y+2z=3
y=3-3x-2z

now go to the other 2 equations and replace y with 3-3x-2z

let @jim_thompson5910 take care of that

oh my

After doing all that, things boil down to these 2 equations
x+z = 1
28x+28z=31