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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

Solve the system   4x+2y+1z=1,−1x−2y−3z=4,1x−1y−1z=3\;4x + 2y + 1z = 1, \quad -1x - 2y - 3z = 4, \quad 1x - 1y - 1z = 3. What is zz?