解二元一次方程组:(1)2x-5y=21,y=-x(2)2s+t=6,t=1/2s+1(3)y=-2x+3,y=3x-7(4)a-3b=1,5a-9b=-13
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![解二元一次方程组:(1)2x-5y=21,y=-x(2)2s+t=6,t=1/2s+1(3)y=-2x+3,y=3x-7(4)a-3b=1,5a-9b=-13](/uploads/image/z/964436-68-6.jpg?t=%E8%A7%A3%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%3A%281%292x-5y%3D21%2Cy%3D-x%282%292s%2Bt%3D6%2Ct%3D1%2F2s%2B1%283%29y%3D-2x%2B3%2Cy%3D3x-7%284%29a-3b%3D1%2C5a-9b%3D-13)
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