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<b>take </b>
 <a href="real_1.html#K1" title="REAL_1:func.1">-</a> 1
;<br/>

<b>thus </b><a NAME="E1:5_2_1"/>
 <a href="real_1.html#K1" title="REAL_1:func.1">-</a> 1 is <a href="xxreal_0.html#V3" title="XXREAL_0:attr.3">negative</a>
 <b>by </b><i><a class="ref" href="xxreal_0.html#D7" title="XXREAL_0:def.7">XXREAL_0:def 7</a></i>;<br/>


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