\[ y''(x)-6 y(x)^2-x=0 \] ✗ Mathematica : cpu = 16.8813 (sec), leaf count = 0
DSolve[-x - 6*y[x]^2 + Derivative[2][y][x] == 0,y[x],x]
, could not solve
DSolve[-x - 6*y[x]^2 + Derivative[2][y][x] == 0, y[x], x]
✗ Maple : cpu = 0. (sec), leaf count = 0
dsolve(diff(diff(y(x),x),x)-6*y(x)^2-x=0,y(x))
, could not solve
dsolve(diff(diff(y(x),x),x)-6*y(x)^2-x=0,y(x))