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for what values of x: [1" "2" "1][{:...

for what values of x:
`[1" "2" "1][{:(1,2,0),(2,0,1),(1,0,2):}][{:(0),(2),(x):}]=0? `

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`[1" "2" "1][{:(1,2,0),(2,0,1),(1,0,2):}][{:(0),(2),(x):}]=0`
`implies [1" "2" "1][{:(0+4+0),(0+0+x),(0+0+2x):}]=0`
`implies [1" " 2" "1][{:((4),(x),(2x):}]=0`
`implies [4+2x+2x]=0`
` implies 4+4x=0implies x=-1`
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