SOLUTION: 13-3z= The answer is 31 over 2. I am not figuring out how the answer was reached, please help with steps.

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Question 467067: 13-3z=
The answer is 31 over 2. I am not figuring out how the answer was reached, please help with steps.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
z=4.33
I don't know where you got your answer from, but it is no good.