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<p dir="ltr"><span>Which of the following equations can be found by adding the equations in the system of equations shown?</span></p>
<p dir="ltr">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span>\(\left\{\begin{array}{l}3x\;+\;5y\;=\;&ndash;9\\&ndash;3x\;&ndash;\;7y\;=\;&ndash;21\end{array}\right.\)</span></p><br>