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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

Solve the system   −2x+2y−3z=10,0x+4y+0z=0,0x+0y+4z=−16\;-2x + 2y - 3z = 10, \quad 0x + 4y + 0z = 0, \quad 0x + 0y + 4z = -16. What is zz?