I'm trying to figure out how to set up a matrix where I dont know the last value ex a+2+4=x, b+4+6=x, c+2+6=x.(adsbygoogle = window.adsbygoogle || []).push({});

Would it be something like this?

[1,0,0,x-6]

[0,1,0,x-10]

[0,0,1,x-8]

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# How do you get rref with a variable in the last column?

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