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Sagot :

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1.  8 + 2 x - 6 =  2 x + 2

2.  10 x² - 30 x

3.  - 8 - 6 x

4.  - 12 + 3 x²

5.  10 x - 12 x + 21 + 9 =  - 2 x + 30

6.   8 x²  - 6 + 4 x

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