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What is the remainder when the poynomial x53-1240-3x27-5x21+x10-3 is divided by x+1? The possible answers were...

What is the remainder when the poynomial x53-1240-3x27-5x21+x10-3 is divided by x+1? The possible answers were -21, -7, -3, 4, and 21. -7 was the correct answer and I'm unsure how they arrived at a single answer without x appearing. If you could show all the steps that would be excellent. Thanks

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