exam Maths Puzzle Numerical Ability

Hi, I just asked for some help a little bit ago and I am stuck again. Here is my question... A supplier of electrical equipment offers a 10% discount for a cash purchase or a 5% d

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please help me with :

simplify

a^0 - 64/2^4 - (-3)^0 - 3^0 - 2[(-3-2^0) - (-3-2)] The problem is:

[(3y-4)/(49-y^2)] + [(2y+1)/(y-7)]

I know i need to find the LCD but somehow my answer doesnt match the one in the back of the book. My answer is (2y^2+18y-3)/[(y-7)(y+7)]. Can you please help me! Thank you!