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3/x - 2/y = 21 menjadi 12/x - 8/y = 84 (-/di kurangi) ,mjd 23/y = -69, maka y = - /3,dan 4/x + 5/y = 5 menjadi 4/x + 5/-1/3 = 5, mjd 4/x = -10, mjd x = -2/5
2. 2/x + 6/y = -1 4/x + 12/y = -2
4/x + 3/y = 1 menjadi 4/x + 3/y = 1 (-/dikurangi) , mjd 9/y = -3, maka
y =-3, dan 4/x + 3/y = 1 mjd 4/x + 3/-3 = 1 ,mjd 4/x = 2, maka x = 2,,