<p>Solve&nbsp; :</p>
<div>&nbsp;<span class="math-editor mathquill-rendered-math"><span class="non-leaf"><span class="scaled paren" style="transform: scale(1, 1.05);">(</span><span class="non-leaf"><var>a</var></span><span class="scaled paren" style="transform: scale(1, 1.05);">)</span></span><span class="fraction non-leaf"><span class="numerator">11</span><span class="denominator">12</span><span style="display: inline-block; width: 0;">&nbsp;</span></span><span class="binary-operator">+</span><span class="fraction non-leaf"><span class="numerator">7</span><span class="denominator">12</span><span style="display: inline-block; width: 0;">&nbsp;</span></span><span class="non-leaf"><span class="scaled paren" style="transform: scale(1, 1.05);">( </span><span class="non-leaf"><var>b</var></span><span class="scaled paren" style="transform: scale(1, 1.05);">)</span></span><span class="fraction non-leaf"><span class="numerator">9</span><span class="denominator">5</span><span style="display: inline-block; width: 0;">&nbsp;</span></span><span class="binary-operator">&minus;</span><span class="fraction non-leaf"><span class="numerator">4</span><span class="denominator">5</span><span style="display: inline-block; width: 0;">&nbsp;</span></span></span>&nbsp;</div>