Answers

The simplest form of -645/42 is -215/14.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 645 and 42 is 3
2. Divide both the numerator and denominator by the GCD
   -645 ÷ 3/42 ÷ 3
3. Reduced fraction: -215/14
   Therefore, -645/42 simplified to lowest terms is -215/14.

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