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2x+3z - y - 2z = 12-3 = 9
2x-y+z= 9
2x-y+z-x+2y = 9-5 = 4
x+y+z = 4
persamaan 3 dikalikan 3=3y+6z=9
eliminasi persamaan didapat persamaan 4=4x-3y=15
persamaan 4=4x-3y=15
persamaan 1 dikalikan 4=4x-8y=20
didapat hasil 5y=-5
y=-1
Masukkan ke persamaan awal=2x+4=10
2x=6
x=3
6+3z=12
3z=6
z=2
x+y+z=3+(-1)+2=4