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OpenStudy (anonymous):
x + y + z = -7 2x + y - z =4 -x + 2y + 2z = -17
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OpenStudy (amistre64):
x + y + z = -7 2x + y - z =4 -------------- 3x +2y = -3 is a good start
OpenStudy (anonymous):
\[\{x=1,y=-3,z=-5\} \]
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