What is the radius and center of this circle?
%7B2%7D%20%20%2B%202x%20-%204y%20-%202%20%3D%200" id="TexFormula1" title=" {x}^{2} + {y}^{2} + 2x - 4y - 2 = 0" alt=" {x}^{2} + {y}^{2} + 2x - 4y - 2 = 0" align="absmiddle" class="latex-formula">
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