3x-2y+z=4 ①
x+y-z=5 ②
4x-4y+3z=27 ③
②×4＋③得 8x-z=47 ④
②×2＋①得 5x-z=14 ⑤
④- ⑤ 得 x=11
z=41
y=35
3x-2y+z=4 x+y-z=5 4x-4y+3z=27
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