title: remove extra parentheses from the list in python
body: <p>I got list from database:</p>
  <pre><code>print(rows)
  print(type(rows))
  [('simplify expression: $$ \\frac{1}{4} + \\frac{1}{2} $$',), ('simplify expression: $$ \\frac{1}{3} + \\frac{2}{3} $$',)]
  &lt;class 'list'&gt;
  </code></pre>
  <p>I need remove extra parentheses, quotes and commas from the list. As results I should get:</p>
  <pre><code>print(rows[0])
  print(rows[1])
  
  simplify expression: $$ \\frac{1}{4} + \\frac{1}{2} $$
  simplify expression: $$ \\frac{1}{3} + \\frac{2}{3} $$
  </code></pre>
  <p>How should I solve my problem?</p>