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OpenStudy (anonymous):
Use the substitution method to solve the following system of equations. 3x + y – z = 2 2x + y + 2z = 8 2x – 3y + z = 21 Choices: A.(3, –4, 3) B.(3, 4, –3) C.(3, 4, 3) D.(–3, 4, 3)
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