span><span class="st">"N_s = N_d"</span><span class="op">)</span> <span class="op">|&gt;</span></span>
<span>  <span class="fu"><a href="../reference/add_equation.html">add_equation</a></span><span class="op">(</span><span class="st">"Yd = W * N_s - T_s"</span><span class="op">)</span> <span class="op">|&gt;</span></span>
<span>  <span class="fu"><a href="../reference/add_equation.html">add_equation</a></span><span class="op">(</span><span class="st">"T_d = theta * W * N_s"</span><span class="op">)</span> <