Answers

The simplest form of -4959/420 is -1653/140.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 4959 and 420 is 3
2. Divide both the numerator and denominator by the GCD
   -4959 ÷ 3/420 ÷ 3
3. Reduced fraction: -1653/140
   Therefore, -4959/420 simplified to lowest terms is -1653/140.

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