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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def process_equations(key, value, fmt, meta):
 """Processes the attributed equations."""


    if key == 'Math' and len(value) == 3:

        # Process the equation
        eq = _process_equation(value, fmt)

        # Get the attributes and label
        attrs = eq['attrs']
        label = attrs[0]
        if eq['is_unreferenceable']:
            attrs[0] = ''  # The label isn't needed outside this function

        # Context-dependent output
        if eq['is_unnumbered']:  # Unnumbered is also unreferenceable
            return None
        elif fmt in ['latex', 'beamer']:
            return RawInline('tex',
                             r'\begin{equation}%s\end{equation}'%value[-1])
        elif fmt in ('html', 'html5') and LABEL_PATTERN.match(label):
            # Present equation and its number in a span
            text = str(references[label])
            outerspan = RawInline('html',
                                  '<span %s style="display: inline-block; '
                                  'position: relative; width: 100%%">'%(''\
                                  if eq['is_unreferenceable'] \
                                  else 'id="%s"'%label))
            innerspan = RawInline('html',
                                  '<span style="position: absolute; '
                                  'right: 0em; top: %s; line-height:0; '
                                  'text-align: right">' %
                                  ('0' if text.startswith('$') and
                                   text.endswith('$') else '50%',))
            num = Math({"t":"InlineMath"}, '(%s)' % text[1:-1]) \
              if text.startswith('$') and text.endswith('$') \
              else Str('(%s)' % text)
            endspans = RawInline('html', '</span></span>')
            return [outerspan, AttrMath(*value), innerspan, num, endspans]
        elif fmt == 'docx':
            # As per http://officeopenxml.com/WPhyperlink.php
            bookmarkstart = \
              RawInline('openxml',
                        '<w:bookmarkStart w:id="0" w:name="%s"/><w:r><w:t>'
                        %label)
            bookmarkend = \
              RawInline('openxml',
                        '</w:t></w:r><w:bookmarkEnd w:id="0"/>')
            return [bookmarkstart, AttrMath(*value), bookmarkend]

    return None