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<b>let </b><font color="Maroon">x</font> be  <a href="xcmplx_0.html#V1">complex</a>  <a href="ordinal1.html#NM1" target="_self">number</a> ;<br/>

<a NAME="E1:6"/>
<font color="Maroon">x</font> <a href="xcmplx_0.html#K6">-</a> 0 <a href="hidden.html#R1">=</a> <font color="Maroon">x</font> <a href="xcmplx_0.html#K2">+</a> 0
 
<b>by </b><i>, <a class="ref" href="xcmplx_0.html#D8">XCMPLX_0:def 8</a></i>;<br/>
<b>hence </b><a NAME="E2:6"/>
<font color="Maroon">x</font> <a href="xcmplx_0.html#K6">-</a> 0 <a href="hidden.html#R1">=</a> <font color="Maroon">x</font>
 <b>by </b><i/>;<br/>


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