[poper]

6) $\sqrt{2x+7}-\sqrt{x}=2$

$\sqrt{2x+7}=\sqrt{x}+2$
$2x+7=x+4\sqrt{x}+4$
$x+3=4\sqrt{x}$
$x^2+6x+9=16x$
$x^2-10x+9=0$
$(x-9)(x-1)=0$
$x=1,9$