Answers

The simplest form of -686/864 is -343/432.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 686 and 864 is 2
2. Divide both the numerator and denominator by the GCD
   -686 ÷ 2/864 ÷ 2
3. Reduced fraction: -343/432
   Therefore, -686/864 simplified to lowest terms is -343/432.

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