Use forward elimination to make the coefficient matrix, A, an upper triangular matrix, and then solve using back substitution, for a sample 2-by-2 system.
Extract leading non-zero digit
Test for balanced parentheses
Find the "ordinary" or Euclidean distance between A and Z
Add two numbers
Sequential Unconstrained Minimization (SUMT) using Exterior Penalty
Bisection method of finding a root.
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