Answers

The simplest form of -1284/1680 is -107/140.

Steps to simplifying fractions

1. Find the GCD (or HCF) of the absolute values of both numerator and denominator
   GCD of 1284 and 1680 is 12
2. Divide both the numerator and denominator by the GCD
   -1284 ÷ 12/1680 ÷ 12
3. Reduced fraction: -107/140
   Therefore, -1284/1680 simplified to lowest terms is -107/140.

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