\[ x y'(x)+\sqrt {y'(x)^2+1}-y(x)=0 \] ✓ Mathematica : cpu = 0.006146 (sec), leaf count = 20
DSolve[-y[x] + x*Derivative[1][y][x] + Sqrt[1 + Derivative[1][y][x]^2] == 0,y[x],x]
\[\left \{\left \{y(x)\to c_1 x+\sqrt {1+c_1{}^2}\right \}\right \}\] ✓ Maple : cpu = 0.033 (sec), leaf count = 15
dsolve((diff(y(x),x)^2+1)^(1/2)+x*diff(y(x),x)-y(x)=0,y(x))
\[y \left (x \right ) = \sqrt {c_{1}^{2}+1}+x c_{1}\]