①+②+③
6X+6Y+6Z=14
X+Y+Z=7/3④
①-④
4X=11/3
X=11/12
③-④
4Y=-13/3
Y=-13/12
③-④
4Z=23/3
Z=23/12
{5X+Y+Z①X+5Y+Z=-2②X+Y+5Z=10③
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