Find the function y=y(x)\displaystyle {y}={y}{\left({x}\right)} (for x>0\displaystyle {x}\gt{0} ) which satisfies the separable differential equation
dydx=4+18xxy2;   x>0\displaystyle {\frac{{{\left.{d}{y}\right.}}}{{{\left.{d}{x}\right.}}}}={\frac{{{4}+{18}{x}}}{{{x}{y}^{{2}}}}};\ \ \ {x}\gt{0}
with the initial condition y(1)=5\displaystyle {y}{\left({1}\right)}={5}.
y=\displaystyle {y}=   .