exam Maths Puzzle Numerical Ability

I am having a hard time breaking this one down.

x^4+X^3-8^2+x-6/x^2+1

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exam Other Question

Solve for the indicated letter.
d=7e, for e
The solution of e is?
How the heck do I go about doing this one, can someone please help?? how do you solve:

r + s + 2t - u = -3
2r + 3s + 3t + u = 2
4r + 2s - t + u = 5
s + 2t + 2u =7