Simplifying Fractions involving negative numbers I want to simplify $$\frac{\frac{7}{-10} \times \frac{-15}{6}}{\frac{7}{-19} + \frac{-17}{-8}}$$
I really don't understand how to do this, or even how to start? 
Negative numbers make it even harder for me to try and simplify it. 

Just simplify the numerator first and then simplify the denominator. 
$$\frac{7}{-10} \times \frac{-15}{6} = \frac{-105}{-60} = \frac{-7}{-4} = \frac{7}{4}$$
leads us to
$$\frac{\frac{7}{4}}{\frac{7}{-19} + \frac{-17}{-8}}.$$
Very similar principle with the denominator.
$$\frac{7}{-19} + \frac{-17}{-8} = \frac{267}{152}$$
gives us 
$$\frac{\frac{7}{4}}{\frac{267}{152}}.$$
To bring this home, rewrite this division of two fractions as a multiplication:
$$\frac{\frac{7}{4}}{\frac{267}{152}} = \frac{7}{4} \times \frac{152}{267} = \frac{1064}{1068} = \frac{532}{534} = \ldots$$
You get the idea.
