Answer
$-12x^{3n}+20x^{2n}-2x^{n+1}$
Work Step by Step
$-4x^n(3x^{2n}-5x^n+\frac{1}{2}x)=\\=-4x^n\cdot3x^{2n}-4x^n\cdot(-5x^n)-4x^n\cdot\frac{1}{2}x\\=-12x^{3n}+20x^{2n}-2x^{n+1}$
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