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Sagot :

VINS

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A = ( 6 + x ) - ( 1 - x ) - ( 7 + x ) - ( x - 4 )

A  = (  6 + 2/3 ) -  ( 1 - 2/3 ) -  ( 7 +  2/3 ) - ( 2 /3 - 4 )

A =   20/3 - (  - 1/3 ) -  ( 23/3 ) - (  - 10/3 )

A =  20/3 + 1/3 + 23 /3 + 10 /3

A =  54/3 = 18

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