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2x + 3y = 6 (di kali 1)
x - y = 3 (di kali 3)
menjadi :
2x + 3y = 6
3x - 3y = 9
___________ +
5x = 15
x = 15/5 = 3
cari y :
x - y = 3
3 - y = 3
-y = 3-3 = 0
y = 0
jadi : x = 3 dan y = 0