exam Maths Puzzle Numerical Ability

b-2/b^2-4

b^2+b/b+1

factor, divide and simplify

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exam Other Question

Can you breakdown or simplify the follwing for my understanding:

1. 6x-5+3x-29

2. 5x+3+6x-11=8x+25

3. 4(-x-2)+5=-2(2x+7)
Okay, I know I need to do cross cancelation, but when doing that you do not mess with the exponents do you?
2x^5/7y^2 X 21y^11/5x^9