{3x+4y=7 3x-5y=2
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{3x+4y=7 3x-5y=2
{3x+4y=7 3x-5y=2
{3x+4y=7 3x-5y=2
3x等于7减4y,把3x带入3x减5y等于2,负9
y等于负5,y等于?x等于?
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