5.$\left\{\begin{matrix}x^2+xy(2y-1)=2y^3-2y^2-x & \\ 6(x-1)+y+7=4xy-4x & \end{matrix}\right.$
6.$\left\{\begin{matrix} 3x^2+3y^2+8=(y-x)(y^2+xy+x^2+6)& \\(x+y-13)(\sqrt{3x-14}-\sqrt{x+1}) =5 & \end{matrix}\right.$
5.$\left\{\begin{matrix}x^2+xy(2y-1)=2y^3-2y^2-x & \\ 6(x-1)+y+7=4xy-4x & \end{matrix}\right.$
6.$\left\{\begin{matrix} 3x^2+3y^2+8=(y-x)(y^2+xy+x^2+6)& \\(x+y-13)(\sqrt{3x-14}-\sqrt{x+1}) =5 & \end{matrix}\right.$
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