book Maths Puzzle Numerical Ability

Does anyone know how to simplify this problem?``

(3x-2)(x-4)-(x-4)(6-5x)/(4-x)(8x-1)

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book Other Question

I NEED HELP SOLVING THIS:
(4X + 3W^2)(4X - 3X^2)
3-1/2|(1/2)x-4| = 2