ĐK: $x\geq -1$hpt $\Rightarrow (x+1)y^{2}+2y\sqrt{x+1}+1=13x+2+7\sqrt{x+1}-1$
$\Leftrightarrow (y\sqrt{x+1}+1)^{2} =13x+7\sqrt{x+1}+1$
từ pt 2 $\Leftrightarrow (7\sqrt{x+1}-1)^{2}=13x+7\sqrt{x+1}+1$
$\Leftrightarrow 36(x+1)-21\sqrt{x+1}+13=0$ ( VNo)
$\Rightarrow $ HPT Vno