Perform the indicated operations and simplify. 
Definitions:
Recirculating Ball
A type of steering mechanism in vehicles that uses a series of ball bearings to minimize friction and wear in the steering box.
Gearbox
In a steering mechanism, the use of gears to increase the mechanical advantage and decrease driver effort in turning the steering wheel while converting the wheel’s motion into motion that moves the vehicle’s front wheels.
U-joint
A universal joint, a flexible pivot point that transmits power allowing for varying angles of the drive shaft.
Steering Assembly
The collection of components in a vehicle that allows the driver to guide and direct the vehicle in the desired direction.
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