\[ a+x y'(x)^3-y(x) y'(x)^2=0 \] ✓ Mathematica : cpu = 0.0041365 (sec), leaf count = 16
DSolve[a - y[x]*Derivative[1][y][x]^2 + x*Derivative[1][y][x]^3 == 0,y[x],x]
\[\left \{\left \{y(x)\to \frac {a}{c_1{}^2}+c_1 x\right \}\right \}\] ✓ Maple : cpu = 0.04 (sec), leaf count = 76
dsolve(x*diff(y(x),x)^3-y(x)*diff(y(x),x)^2+a=0,y(x))
\[y \left (x \right ) = \frac {3 \,2^{\frac {1}{3}} \left (a \,x^{2}\right )^{\frac {1}{3}}}{2}\]