book Maths Puzzle Numerical Ability

i need help with like-terms. here is one of my problems......

(6v^5-5v)-5(7v^5-2v-7)

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book Other Question

In A.D. 1054, Chinese astronomers observed a light from a supernova in the night sky. This supernova was the incredibly powerful origin of what is now the Crab Nebula. Can you please help me with this problem: Find each value given that f(x)=2x+1
f(3)+f(2).
And: Find the domain and range of f(x)= 1/x-4. I know the domain is x and the range is y, but how do I figure it on a fraction?
Thank You