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What must be subtracted from x^3-6x^2-15...

What must be subtracted from `x^3-6x^2-15 x+80` so that the result is exactly divisible by `x^2+x-12 ?`

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Hence, `4x-4` should be subtracted to `x^3-6x^2-15x+80` so that the result is exactly divisible by `x^2+x-12`.
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