\[ \boxed { {\frac {\rm d}{{\rm d}x}}y \left ( x \right ) -1=0} \]
Mathematica: cpu = 0.032004 (sec), leaf count = 27 \[ \left \{\left \{y(x)\to x \sinh \left (c_1-\log (x)\right )\right \},\left \{y(x)\to x \sinh \left (c_1+\log (x)\right )\right \}\right \} \]
Maple: cpu = 0.015 (sec), leaf count = 7 \[ \left \{ y \left ( x \right ) =x+{\it \_C1} \right \} \]