Answers

The simplest form of -513/420 is -171/140.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 513 and 420 is 3
2. Divide both the numerator and denominator by the GCD
   -513 ÷ 3/420 ÷ 3
3. Reduced fraction: -171/140
   Therefore, -513/420 simplified to lowest terms is -171/140.

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