[[_high_order, _missing_y]]
Book solution method
TO DO
Mathematica ✓
cpu = 0.00903929 (sec), leaf count = 27
Maple ✓
cpu = 0.011 (sec), leaf count = 19
DSolve[5*y'''[x] + x*y''''[x] == 0,y[x],x]
Mathematica raw output
{{y[x] -> -C[1]/(24*x^2) + C[2] + x*C[3] + x^2*C[4]}}
Maple raw input
dsolve(x*diff(diff(diff(diff(y(x),x),x),x),x)+5*diff(diff(diff(y(x),x),x),x) = 0, y(x),'implicit')
Maple raw output
y(x) = _C1+_C2*x+_C3*x^2+_C4/x^2