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Mar 30th, 2017
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  1. $$systeme*{2x-y+2z+t=-2,x+y-5t=5}
  2. leftrightarrow
  3. begin{bmatrix}
  4. 2&-1&2&1&-2\
  5. 1&1&-5&0&5
  6. end{bmatrix}$$
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