Answers

The simplest form of -423/840 is -141/280.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 423 and 840 is 3
2. Divide both the numerator and denominator by the GCD
   -423 ÷ 3/840 ÷ 3
3. Reduced fraction: -141/280
   Therefore, -423/840 simplified to lowest terms is -141/280.

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