Answer
$6x(x-5)(x+4)$
Work Step by Step
$6x^3-6x^2-120x$
$6x(x^2-x-20)$
$6x(x^2-5x+4x-20)$
$6x(x(x-5)+4(x-5))$
$6x(x-5)(x+4)$
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