A system uses 2,380 J of energy to do work as 12,900 J of heat are added to the system. The change in internal energy of the system is ____ J.

A system uses 2,380 J of energy to do work as 12,900 J of heat are add

1.	A system uses 2,380 J of energy to do work as 12,900 J of heat are added to the system. The change in internal energy of the system is ____ J.
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A system uses 2,380 J of energy to do work as 12,900 J of heat are added to the system. The change in internal energy of the system is ____ J.

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