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For what values of aa n db , the followi...

For what values of `aa n db` , the following system of equations is consistent? `x+y+z=6` `2x+5y+a z=b` `x+2y+3z=14`

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`|A|=0`
`[[2, 5, a], [1, 2, 3 ], [1, 1, 1]]=0`
`2(2-3)-5(1-3)+a(1-2)=0`
...
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