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3x - y = 14
--------------------- Ditambah
5x = 20
x = 4
----------------------
Substitusikan x ke persamaan 2x + y = 6
2x + y = 6
2(4) + y = 6
8 + y = 6
y = 6 - 8
y = -2
---------------------
Hasilnya
x = 4
y = -2