Write the Word or Phrase That Best Completes Each Statement $$\sqrt { 2 x + 7 } = \sqrt { - 9 x - 5 } \cdot 2 x + 7 = 9 x + 5$$

Write the word or phrase that best completes each statement or answers the question.
Provide an appropriate response.
-Explain what is wrong with this first step in the solution process for the equation $$\sqrt { 2 x + 7 } = \sqrt { - 9 x - 5 } \cdot 2 x + 7 = 9 x + 5$$