Question 680635
{{{(7x^2 - 3t)(3x + 8t)}}}
...
{{{7x^2(3x) + 7x^2(8t) - 3t(3x) - 3t(8t)}}}
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{{{highlight_green(21x^3 + 56tx^2 - 9tx - 24t^2)}}}

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