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All published worksheets from http://sagenb.org
Project: sagenb.org published worksheets
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[ 3 -6 6 0]
[-2 4 -2 0]
[ 1 -2 0 0]
[ 0 0 1 0]
(2*x_2, x_2, 0)
[ 2 2 4 8]
[ -4 -4 -8 -16]
[ 0 -3 -3 12]
[ 1 0 1 8]
[ 0 1 1 -4]
[ 0 0 0 0]
(x_1, x_2, x_3)
(-x_3 + 8, -x_3 - 4, x_3)