+(5/28)b+(1/28)b+(3/7)c"  "(4/7)a+(5/14)b" </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 7 "(1/8)b+(1/4)c"                   "(1/2)a+(1/4)b"  </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 8 "0"                               "0"              </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   4                         </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> 0 "0"                       </span>
<span class="r-out co"><span class="r-pr">#&gt;