n of the subtrahend x. <span class="math display">\[ \text{operator-}(x) = (-x)
\]</span></p>
<!-- real; operator+; (real x); -->

<p><code>real</code> <strong><code>operator+</code></strong><code>(real x)</code><br>Return the value of x. <span class="math display">\[ \text{operator+}(x) = x \]</span></p>
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