5X+2y=8 3x-y=7
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5X+2y=8 3x-y=7
5X+2y=8 3x-y=7
5X+2y=8 3x-y=7
6x-2y=14.②
将②加上①得:11x=14+8
11x=22
x=2
将x=2代入原方程5×2+2y=8
2y=8-10
y=-1
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3x+5y-(x+y)=6 2(x+y)-3x=-7
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