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-3x+y=-11 |x3| -9x+3y=-33
_____________+
-7x = 21
x = -3
disubtitusikan
2x - 3y = 12
2(-3) - 3y = 12
-6 -3y = 12
-3y = 18
y = -6
jadi : x=-3 dan y=-6