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First determine by trial that 2, 3, 6, 13, 26, and 36 are the only integral factors of 78 and that 2, 3, 4, 6, 7, 9, 14, 21, 42, and 63 are the only integral factors of 126. The greatest common factor is 6; therefore, divide both numerator and denominator by 6 to result in -13/21.

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Q: How do you simplify -78 over 126?
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