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x+3y-z=1 ...(1)
2x-y+2z=4 ...(2)
2x+y+3z=12 ...(3)
eliminasi... kalo saya 1&2. eliminasi yang x
nanti dpt persamaan
7y-4z=-2 ...(4)
eliminasi lagi.. 2&3. eliminasi yang x juga nanti dpt persamaan
-2y-z=-8 ...(5)
eliminasi persamaan 4 & 5
nanti dapet z = 4 & y = 2
y+z = 2+4 = 6