exam Maths Puzzle Numerical Ability

Subtract. 4x - 2x^2 + 4x^3 from 4x^3 + x - 3x^2.

I am in dire need of help. Thanks.

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x3/2=27 and 3/4=1-3x-2/x=1 on page 196
#8
i dont understand how im surppose to answer it.
im confused.