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Verified answer
Eliminasi xx - y = 12
x + y = 6
______ _
-2y = 6
y = 6 : -2
y = -3
substitusi y = -3 ke persamaan x - y = 12
x - (-3) = 12
x + 3 = 12
x = 12 - 3
x = 9
maka himpunan penyelesaiannya (9, -3)