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As a quality control analyst at a manufacturing plant, you use the combined rate formula 1a+1b=c\frac{1}{a} + \frac{1}{b} = c to track the efficiency of two testing machines. In this formula, aa and bb represent the individual times (in hours) each machine takes to complete a test batch, and cc represents their combined rate.

Before rearranging this equation to solve for the individual runtime aa, you must note the mathematical restrictions on the variables. Because division by zero is undefined in mathematics, neither aa nor bb can be equal to ____.

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