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Jackie and Alexa were working on homework together when Jackie said, “I got as the solution, but it looks like you got something different. Which solution is right?”

I think you made a mistake,” said Alexa. Did Jackie make a mistake? Help Jackie figure out whether she made a mistake and, if she did, explain her mistake and show her how to solve the equation correctly. Jackie’s work is shown at right.

Remember that and .

You can tell if your answer is correct if you substitute it back into the original equation and obtain a true result.