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To calculate, you can find equations in googleable papers on hybrid power-split transmissions, or look up torque summing drives.
Do note that automotive differentials are not meant for continuous significant speed differential. They have only thrust washers - flat bushings - for the spider and side gears.
You might be able to creatively misuse some planetary gearsets, or rob a mechanical skid-steer loader to get a combining drive.
Apologies for terseness, home from work with something, and about out of think.
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