1.3(x+y)-4(x-y)=4 x+y/2 + x-y/6 =6 2.x+2y+3z=7 2x+y+z=7 3x+y+2z=11 3.x:y:z=1:2:7 2x-y+3z=214.4x-3y=1 x+2y-z=5 3x-y+2z=2
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![1.3(x+y)-4(x-y)=4 x+y/2 + x-y/6 =6 2.x+2y+3z=7 2x+y+z=7 3x+y+2z=11 3.x:y:z=1:2:7 2x-y+3z=214.4x-3y=1 x+2y-z=5 3x-y+2z=2](/uploads/image/z/8619437-29-7.jpg?t=1.3%28x%2By%29-4%28x-y%29%3D4+x%2By%2F2+%2B+x-y%2F6+%3D6+2.x%2B2y%2B3z%3D7+2x%2By%2Bz%3D7+3x%2By%2B2z%3D11+3.x%3Ay%3Az%3D1%3A2%3A7+2x-y%2B3z%3D214.4x-3y%3D1+x%2B2y-z%3D5+3x-y%2B2z%3D2)
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