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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

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