7x-4y-20z=0
10x-13y-14z=0
3x+4y-9z=11
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10x – 13y – 14z = 0. →. (2). (1). ×. 13. 91x – 52y -260z = 0. (2). ×. 4. 40x – 52y – 56z = 0. 51x – 204z. = 0. →. (4). 7x – 4y – 20z = 0. 3x +4y – 9z = 1
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