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x = 4 + 2y - z
di sub ke 2
3x - 5y + 3z = 1
3 ( 4 + 2y - z ) - 5y + 3z = 1
12 + 6y - 3z - 5y + 3z = 1
12 + y = 1
y = - 11
disub ke 3
2x + 7y - z = 8
2 (4+2y-z) +7y +z = 8
8 + 4y - 2z + 7y + z = 8
11y - 2z = 0
11.(-11) = 2z
-121/2 = z
z = 60,5
disub ke 1
x - 2y + z = 4
x + 22 + 60,5 = 4
x = 4 - 82,5
x = -78,5
gayakin sih maaf kalau salah