2x1-x2=7x1+2x2-x3=1-x2+2x3=1

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Solution for 2x1-x2=7x1+2x2-x3=1-x2+2x3=1 equation: 



2x^1-x2=7x^1+2x^2-x3=1-x2+2x^3=1

We move all terms to the left:

2x^1-x2-(7x^1+2x^2-x3)=0

We do not support expression: x^1

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