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=> 8x-3y=60 》24x-9y=180
6x+9y=6 》6x + 9y= 6
》30x=186
x=6.2
=> 2/3 (6.2) - 1/4 y = 5
4.13 - 5 = 1/4 y
-0.87 = 1/4 y, y = -3.47
=> x - 2y = ?
6.2 - (-6.9) = 13.94 = 14.
maaf kalau salah.