\[ a \left (-\sqrt {y(x)}\right )-b x+y'(x)=0 \] ✓ Mathematica : cpu = 0.227216 (sec), leaf count = 114
\[\text {Solve}\left [\frac {a^2 \log \left (a^2 \left (\sqrt {\frac {a^2 y(x)}{b^2 x^2}}-\frac {2 y(x)}{b x^2}+1\right )\right )+2 a^2 \log (x)+\frac {2 a^3 \tanh ^{-1}\left (\frac {a^2-4 b \sqrt {\frac {a^2 y(x)}{b^2 x^2}}}{a \sqrt {a^2+8 b}}\right )}{\sqrt {a^2+8 b}}+2 b c_1}{b}=0,y(x)\right ]\]
✓ Maple : cpu = 0.095 (sec), leaf count = 68
\[ \left \{ -{\frac {1}{2}\ln \left ( \sqrt {y \left ( x \right ) }ax+b{x}^{2}-2\,y \left ( x \right ) \right ) }+{a\sqrt {y \left ( x \right ) }{\it Artanh} \left ( {1 \left ( a\sqrt {y \left ( x \right ) }+2\,bx \right ) {\frac {1}{\sqrt {y \left ( x \right ) \left ( {a}^{2}+8\,b \right ) }}}} \right ) {\frac {1}{\sqrt {y \left ( x \right ) \left ( {a}^{2}+8\,b \right ) }}}}+{\it \_C1}=0 \right \} \]