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✓ Mathematica : cpu = 0.199334 (sec), leaf count = 94
DSolve[-a + Derivative[1][y][x]^2 + y[x]*Derivative[2][y][x] == 0,y[x],x]
✓ Maple : cpu = 0.045 (sec), leaf count = 39
dsolve(diff(diff(y(x),x),x)*y(x)+diff(y(x),x)^2-a=0,y(x))
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