exam Maths Puzzle Numerical Ability

I am totally lost on this two question and need some help.
Solve and check the following eqaution for x:
x/x-5+2=5/x-5

and

5/x+6+2/x^2+7x+6=3/x+1 Thank you

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exam Other Question

8. Factoring is very hard for me. How do I complete this one?

15x^2 + 7x - 2

thank you for your help.
A box contains four defective and six good electronic sensors. If five sensors are drawn, with replacement, find the probability of drawing
(a) at most one defective
(b) at least