Question: For the following exercises, solve each system by substitution. 3x - 4y + 2z = -15 2x + 4y + z = 16 2x +

For the following exercises, solve each system by substitution. 

3x - 4y + 2z = -15 2x + 4y + z

3x - 4y + 2z = -15 2x + 4y + z = 16 2x + 3y + 5z - 20

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