x + 4y + z = –10
3x – 3y + 6z = –21
x + 2y + 2z = –10
(1, –2, –3)
(–4, –1, –2)
(–3, –2, –3)
(2, –2, –4)
(-4,-1,-2);
from 3): -4-2-4=-10.
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(–4, –1, –2)
(-4,-1,-2);
from 3): -4-2-4=-10.