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3x + 3y = 7
---------------------- ---
(di eliminasi mau menghilangkan variabel "y")
2x = 8
3x = 7
---------- --
-x = 1
x = -1
setelah itu x nya dimasukkan ke salah satu persamaan :
3x + 3y = 7
3 (-1) + 3y = 7
-3 + 3y = 7
3y = 7 + 3
y = 10 / 3
y =