$\begin{array}{1 1}(a)\;7x^2+7y^2+2xy+10x-10y+7=0\\(b)\;7x^2-7y^2-2xy+10x-10y-7=0\\(c)\;7x^2+7y^2+2xy+10x+10y+10=0\\(d)\;x^2+y^2+2xy+10x-10y+7=0\end{array}$

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