exam Maths Puzzle Numerical Ability

i need help with this problem it is 1/2x-3/5=1/10+3/10

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exam Other Question

This one stumps me and the book if NO help, no examples

given that (3x-a)(x-2)(x-7)=3x^3-32x^2+81x-70, determine value of a????

I had no idea where to start. square root of 1/2 show that it is irrational