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1/y = b
3a + b = 2 ...
a - 2b = 5... kalikan 3
..
3a +b = 2
3a - 6b = 15
kurangkan
7b = -13 --> b = -13/7 dan a = 5+2b --> a = 5- 2(13/7) = 9/7
a= 9/7 --> x = 7/9
b = -13/7 ---> y = - 7/13