In this answer to this Limit, I am not sure how they got -1, please can someone kindly explain to me why?

Thank you for the opportunity to help you with your question!

This appears to be very easy problem, but the real question is not presented here, so kindly send the question for me to answer.

Use the Limit Laws and the graphs of f and g in Figure 1 to evaluate the following limits

if they exist.

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