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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

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