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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

Solve the system   2x−2y−1z=6,3x+0y+3z=6,−3x−2y+1z=−4\;2x - 2y - 1z = 6, \quad 3x + 0y + 3z = 6, \quad -3x - 2y + 1z = -4. What is zz?