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Sagot :

Bonjour,

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

4x-(3-6x) = 4x-3+6x = 10x-3

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

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

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