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3x + 4y = 1 |dikali 3
20x + 12y = 36
9x + 12y = 3
------------ Dikurangi
11x = 33
x = 3
y=1/7
5x + 3/7 = 9
5x = 9 - 3/7
5x = 60/7
x = 60/7 x 1/5
x = 60/35