[_separable]
Book solution method
Separable ODE, Neither variable missing
Mathematica ✓
cpu = 0.0167342 (sec), leaf count = 21
Maple ✓
cpu = 0.008 (sec), leaf count = 17
DSolve[(1 - x)*y[x] + x^2*(1 - y[x])*y'[x] == 0,y[x],x]
Mathematica raw output
{{y[x] -> -ProductLog[-(E^(x^(-1) - C[1])*x)]}}
Maple raw input
dsolve(x^2*(1-y(x))*diff(y(x),x)+(1-x)*y(x) = 0, y(x),'implicit')
Maple raw output
1/x+ln(x)+y(x)-ln(y(x))+_C1 = 0