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4/x + 1/y = -1 ..... n
m(1), n(3)
2/x - 3/y = -4
12/x + 3/y = -3
Eliminasikan, dengan cara tambahkan m dan 3n tadi! - 3/y milik m dapat habis dengan 3/y milik n
maka, 14/x = -7
-7x = 14
x = 14/-7
x = -2 .... A