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y + z = 6
3x + y + z = 3
Subtitusikan y + z
3x + y + z = 3
3x + 6 = 3
3x = 3 - 6
3x = -3
x = -1
Subtitusikan x
x + y = 1
-1 + y = 1
y = 2
Subtitusikan y
y + z = 6
2 + z = 6
z = 6 - 4
z = 4
Jawabannya
x = -1
y = 2
z = 4
Semoga bermanfaat.