If a person signs on for an appointment at two companies at the same time, there may be a conflict of interest. A person should schedule their appointments for times that do not conflict.
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The sum of a set of addends whose sign is the same is the sum of the absolute values of the addends with the same sign as the addends.
Add their magnitudes, and keep the same sign for the sum.
Do the addition. Keep the sign.
Add the magnitudes, keep the sign.