x=\frac{2(\sqrt2+2)(\sqrt2-2)+0,6:0,2}{0,8*5*(-\frac{3}{4^2})}=
=\frac{2(2-4)+3}{4*(-\frac{3}{16})}=\frac{2*(-2)+3}{-\frac{3}{4}}=\frac{-4+3}{-\frac{3}{4}}=
=\frac{-1}{-\frac{3}{4}}=\frac{4}{3}
$10,5%\frac{4}{3}=\frac{10,5}{100}\frac{4}{3}=\frac{42}{300}=\frac{14}{100}=0,14 $odp.