(a) is the final tableaux
(b) requires additional pivoting
(c) indicates no solution to the problem
x1 x2 s1 s2
-4 1 0 2 | 18 x2
-6 0 1 4 | 12 s1
- - - - - - - - - - - - - - - -|- - - - -
-5 0 0 6 | 10
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