x + 2y + 3 [ 3x - 3 ] = 9

2x - y + [3x - 3 ] = 8

10x + 2y = 18

5x - y = 11

10x + 2y = 18

10x - 2y = 22______add

20 x = 40

x = 2

20 + 2y = 18

y = - 1

2 - 2 + 3z = 9

z = 3

x = 2 , y = - 1, z = 3

https://gyazo.com/830f1cffa3611d51cf1e5b1fcf4cf453

continues:

https://gyazo.com/c7ca08fbf29b66fca45098fc231f8c04

x=2 ; y=-1 ; z=3

Original link:

http://www.math.odu.edu/~bogacki/cgi-bin/lat.cgi