✓ Mathematica : cpu = 1.59365 (sec), leaf count = 252
DSolve[EulerGamma + beta*x + alpha*y[x] + (c + b*x + a*y[x])*Derivative[1][y][x] == 0,y[x],x]
✓ Maple : cpu = 0.319 (sec), leaf count = 178
dsolve((a*y(x)+b*x+c)*diff(y(x),x)+alpha*y(x)+beta*x+gamma = 0,y(x))