span class="special">(</span><span class="identifier">a2</span> <span class="special">*</span> <span class="identifier">Ek</span> <span class="special">-</span> <span class="identifier">b2</span> <span class="special">*</span> <span class="identifier">Kk</span><span class="special">)</span> <span class="special">/</span> <span class="special">(</span><span class="identifier">a2</span> <span class="special">-</span> <span class="identifier">b2</span><span class="special">);</span>
      <span class="identifi