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eliminasi y
6y + 36x = 3xy
6y + 4x = - xy
------------------- -
32x = 4xy
y = 8
subtitusi y = 8 ke 6y + 4x = - xy, diperoleh:
6×8 + 4x = - x×8
48 + 4x = - 8x
12x = - 48
x = - 5