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The 5X square +4-3x-5x-2x-5+6x square is simplified and then evaluated.
The original formula is 5x 2+4-3x 2-5x-2x 2-5+6x.

Merge similar projects (5-3-2) x 2+(6-5) x- 1

The result is x- 1.

Some websites have a detailed analysis of this kind of problems, such as onion mathematics, which is quite clear.

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