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-6.2  

remember you will end in the negative zone. when below zero we add numbers but we have a negative symbol in front of the number.

When doing these problems  

1. Cancel numbers; Check if numbers have similar factors. then divide them by that factor division is legal as long as the numbers are integers and not decimals, If there are similar factors.

2. After that is complelted multiply the numerators together and the denominators. 

3. Once this is complelted it may still be possible that you need further reducing so bring the fraction to its simplist form