solve 2x 5y 3z w=25, 3x 2y z 2w=18, 5x 3y 4z-w=19, x 2y 3z 4w=30,solve 2x 5y 3z w=25, 3x 2y z 2w=18, 5x 3y 4z-w=19, x 2y 3z 4w=30,

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