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Sagot :

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

=x-2+3x-3+4x+4-5x

=3x-1

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

= x-2+3x-3+4x+4-5x

= 3x-1

 

D est égale a 3x-1.

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