exam Maths Puzzle Numerical Ability

Can someone please help me.

(7/10x^3-3/10x-1/8)-(-1/10x^3+3/10x-1/8)

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I am having a problem converting the linear to fractions of chart. I have got the answers to these questions, but don't know how to write them done in linear forms. I would really Given that (3x-a)(x-2)(x-7) = 3x^3-32x^2=81x-70, determine the value of a. My answer came out to be 3, but not sure of my answer. thanks for looking over my answer.