{3x-2y=8 y+4x=7的解
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{3x-2y=8 y+4x=7的解
{3x-2y=8 y+4x=7的解
{3x-2y=8 y+4x=7的解
y=7-4x
3x-2(7-4x)=8
x=2
y=-1
X=2 Y=-1
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