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The equation of the line x+y+z-1=0, 4x+y...

The equation of the line `x+y+z-1=0`, `4x+y-2z+2=0` written in the symmetrical form is

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`x+y+z-1=0`
`4x+y-2z+2=0`
`vecb=vecn_1*vecn_2`
`=|[i,j,k],[1,1,1],[4,1,-2]|=-3hati+6hatj-3hatk`
`vecb=3(-hati+2hatj-hatk)`
`DR=(-1,2,-1)`
`Z=0`
`x+y-1=0`
...
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