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OpenStudy (anonymous):
The following system is solved by substitution. Which expression is substituted for z in the second and third equations? x + 5y - z = 6 3x - y - 2z = 4 3x - 2y + 3z = 13 x + 5y + 6 x + 5y - 6 -x - 5y + 6 -x - 5y - 6
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