$Q=8,75\frac{m^3}{s}$

$Q=\frac{A}{n}*R_h^{\frac{2}{3}}*S_0^{\frac{1}{2}}$

$A=2y$

$8,75=\frac{2y}{0,012}(\frac{y}{y+1}{)}^{\frac{2}{3}}*(0,0015{)}^{\frac{1}{2}}$

$n=0,012$

$S_0=0,0015$

$Rh=(\frac{y}{y+1})$

$(\frac{(8,75)(0,012)}{2y*(0,0015{)}^{\frac{1}{2}}}{)}^{\frac{3}{2}}=((\frac{y}{y+1}{)}^{\frac{2}{3}}{)}^{\frac{3}{2}}$

$\frac{0,012}{y^{\frac{3}{2}}*(0,0076)}=\frac{y}{y+1}$

Can you please show how did we find the last part of calculation step by step clearly $?$

How it is simplified $?$