Answers

The simplest form of -40/168 is -5/21.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 40 and 168 is 8
2. Divide both the numerator and denominator by the GCD
   -40 ÷ 8/168 ÷ 8
3. Reduced fraction: -5/21
   Therefore, -40/168 simplified to lowest terms is -5/21.

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