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A B
2 4 2 6
2x -3 4 y
masih ada sedkit salah di B sel baris 1 kolom 2 harusnya=4
A = B .....
2x = 4 .......x =4/2 =2
-3 = y ....... y= - 3
2x-y = 2x2 - (-3) = 4+3=7