Taking LHS and applying R2->R2-2R1 and R3->R3-3R1 you GET X+y x x 3x+2y 2x 0 7x+5y 5x 0Now expand along c3 X | 3x+2y 2x 7x+5y 5x | Now solving X[5x(3x+2y)-2x(7x+5y)]Solving this equation you get the value x^3
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