ze: 12px;"><span class="variableNameElement" style="white-space: pre; font-style: normal; color: rgb(64, 64, 64); font-size: 12px;">x = </span></div><div style="white-space: pre; font-style: normal; color: rgb(64, 64, 64); font-size: 12px;">  -3.0000e+00
   1.0000e+00
   4.0000e+00
  -2.0000e+00
</div></div></div></div></div></div></div><div class = "S0"></div><div class = 'SectionBlock containment'><div class = "S1"><span class = "S2"><span class="S0">The pivoted factorization and triangular substitutions 