Question 220252
-2x-3y-z=5
-x-2y-3z=-3
3x+3y+7z=2 
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Det = -2(-14+9) + 3(-7+9) -(-3+6)
= 10 + 6 - 3
= 13
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I get:
x = -5
y = 1
z = 2