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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

Solve the system   2x−3y−3z=1,−1x+4y+3z=5,1x+4y+0z=9\;2x - 3y - 3z = 1, \quad -1x + 4y + 3z = 5, \quad 1x + 4y + 0z = 9. What is zz?