\[ y'(x)+\sin \left (y'(x)\right )-x=0 \] ✓ Mathematica : cpu = 0.0404544 (sec), leaf count = 38
DSolve[-x + Sin[Derivative[1][y][x]] + Derivative[1][y][x] == 0,y[x],x]
\[\text {Solve}\left [\left \{x=K[1]+\sin (K[1]),y(x)=\frac {K[1]^2}{2}+K[1] \sin (K[1])+\cos (K[1])+c_1\right \},\{y(x),K[1]\}\right ]\] ✓ Maple : cpu = 0.043 (sec), leaf count = 16
dsolve(sin(diff(y(x),x))+diff(y(x),x)-x=0,y(x))
\[y \left (x \right ) = \int \RootOf \left (\sin \left (\textit {\_Z} \right )+\textit {\_Z} -x \right )d x +c_{1}\]