Your answer would be 4.23 as the answer will be a long one, estimated.
Step-by-step explanation:

<h3>
Answer: C) I and II only</h3>
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Work Shown:
Part I

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Part II

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Part III

3 - 4z - 4 = 3z - 2 - z
-4z - 1 = 2z - 2
2z + 4z = -1 + 2
6z = 1
z = 1/6
Hope this helps!