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Linear AlgebraHardRow Reduction & Rank

Row Reduction & Rank · Hard problem

Solve the system   3x−2y+4z=20,0x+3y+4z=20,2x+0y+3z=15\;3x - 2y + 4z = 20, \quad 0x + 3y + 4z = 20, \quad 2x + 0y + 3z = 15. What is xx?