\[ a+x y'(x)^2-y(x) y'(x)=0 \] ✓ Mathematica : cpu = 0.0038925 (sec), leaf count = 16
DSolve[a - y[x]*Derivative[1][y][x] + x*Derivative[1][y][x]^2 == 0,y[x],x]
\[\left \{\left \{y(x)\to \frac {a}{c_1}+c_1 x\right \}\right \}\] ✓ Maple : cpu = 0.04 (sec), leaf count = 35
dsolve(x*diff(y(x),x)^2-y(x)*diff(y(x),x)+a = 0,y(x))
\[y \left (x \right ) = -2 \sqrt {a x}\]