exam Maths Puzzle Numerical Ability

Divide Following rational expressions :

1- 25xy^2 / 7z divided by 5x^2y^2 / 14z^2 numerator / denominator

2- x^2-12x+32 / x^2-6x-16 divided by x^2-x-12 / x^2-5

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| 20x^6y^4 I need help with pre-algebraand algebra i think it will help me if I had example problems.I have touble remembering formulas.I am trying to get into a selective enrollment highschool, and i am barely getting by in math.Please help me.