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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

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