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5x x x
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5x x
5x x x
x 2 5x x 7
f x )u003d 5x x 3
5x 8 x 2 x 2
x x 2 5x 6
f x )u003d 5x x 2
x 2 x 5x 5 0
x 5x 3 3 x 2
5x x x 3
5x x x 2
5x x x
