Just compare the number of kilograms.
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kPa is a unit of pressure, kg is a unit of mass
To balance the scales, the weights on each side must have the same total mass. In this case, the left side has a total mass of 10kg (1kg + 4kg + 5kg) and the right side has a total mass of 16kg (2kg + 6kg + 8kg). To balance them, you need to swap the 4kg weight on the left side with the 6kg weight on the right side. This would make both sides have a total mass of 14kg (1kg + 6kg + 5kg = 2kg + 4kg + 8kg).
5kg subtracted by 730g = -725