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Answer:
[tex]\frac{3}{4}[/tex]
Step-by-step explanation:
You have to find the difference between two variables that are continuously listed for example: -9,-5. If the list is going up, you'll sum them, if it's going down, you subtract them.
[tex]\frac{7-4}{(-9)-(-5)}\\=\frac{3}{4}[/tex]