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Sagot :

Bonjour

3x-7-(5x-3)= 3x - 7 - 5x + 3 = - 2x - 4

3x-7*(5x-3)= 3x - 35x + 21 = - 32x + 21

5x-4+(2x-7)-(-6x-3)-(4x-8)

= 5x - 4 + 2x - 7 + 6x + 3 - 4x + 8

= 5x + 2x + 6x - 4x - 4 - 7 + 3 + 8

= 9x.

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