book Maths Puzzle Numerical Ability

4x+2x-4=8

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book Other Question

Rewrite the middle term as the sum of two terms and then factor completely

4z^3 - 18z^2 - 10z
Can you help?

4^-1x^2y^-3/6^-1x^-1y^2 simplify

I got 3x^3/2y^5 or 1x^3/2y^5

How far off am I?